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860 lines
22 KiB
860 lines
22 KiB
package vm
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import (
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"bytes"
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"errors"
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"fmt"
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"math/big"
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. "github.com/tendermint/tendermint/common"
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"github.com/tendermint/tendermint/events"
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"github.com/tendermint/tendermint/types"
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"github.com/tendermint/tendermint/vm/sha3"
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)
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var (
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ErrUnknownAddress = errors.New("Unknown address")
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ErrInsufficientBalance = errors.New("Insufficient balance")
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ErrInvalidJumpDest = errors.New("Invalid jump dest")
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ErrInsufficientGas = errors.New("Insuffient gas")
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ErrMemoryOutOfBounds = errors.New("Memory out of bounds")
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ErrCodeOutOfBounds = errors.New("Code out of bounds")
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ErrInputOutOfBounds = errors.New("Input out of bounds")
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ErrCallStackOverflow = errors.New("Call stack overflow")
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ErrCallStackUnderflow = errors.New("Call stack underflow")
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ErrDataStackOverflow = errors.New("Data stack overflow")
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ErrDataStackUnderflow = errors.New("Data stack underflow")
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ErrInvalidContract = errors.New("Invalid contract")
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)
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type Debug bool
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const (
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dataStackCapacity = 1024
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callStackCapacity = 100 // TODO ensure usage.
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memoryCapacity = 1024 * 1024 // 1 MB
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dbg Debug = true
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)
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func (d Debug) Printf(s string, a ...interface{}) {
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if d {
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fmt.Printf(s, a...)
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}
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}
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type VM struct {
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appState AppState
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params Params
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origin Word256
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txid []byte
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callDepth int
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evc events.Fireable
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}
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func NewVM(appState AppState, params Params, origin Word256, txid []byte) *VM {
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return &VM{
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appState: appState,
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params: params,
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origin: origin,
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callDepth: 0,
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txid: txid,
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}
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}
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// satisfies events.Eventable
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func (vm *VM) SetFireable(evc events.Fireable) {
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vm.evc = evc
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}
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// CONTRACT appState is aware of caller and callee, so we can just mutate them.
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// value: To be transferred from caller to callee. Refunded upon error.
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// gas: Available gas. No refunds for gas.
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// code: May be nil, since the CALL opcode may be used to send value from contracts to accounts
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func (vm *VM) Call(caller, callee *Account, code, input []byte, value int64, gas *int64) (output []byte, err error) {
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exception := new(string)
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defer func() {
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if vm.evc != nil {
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vm.evc.FireEvent(types.EventStringAccReceive(callee.Address.Postfix(20)), types.EventMsgCall{
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&types.CallData{caller.Address.Postfix(20), callee.Address.Postfix(20), input, value, *gas},
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vm.origin.Postfix(20),
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vm.txid,
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output,
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*exception,
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})
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}
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}()
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if err = transfer(caller, callee, value); err != nil {
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*exception = err.Error()
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return
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}
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if len(code) > 0 {
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vm.callDepth += 1
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output, err = vm.call(caller, callee, code, input, value, gas)
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vm.callDepth -= 1
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if err != nil {
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*exception = err.Error()
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err := transfer(callee, caller, value)
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if err != nil {
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// data has been corrupted in ram
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panic("Could not return value to caller")
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}
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}
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}
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return
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}
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// Just like Call() but does not transfer 'value' or modify the callDepth.
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func (vm *VM) call(caller, callee *Account, code, input []byte, value int64, gas *int64) (output []byte, err error) {
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dbg.Printf("(%d) (%X) %X (code=%d) gas: %v (d) %X\n", vm.callDepth, caller.Address[:4], callee.Address, len(callee.Code), *gas, input)
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var (
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pc int64 = 0
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stack = NewStack(dataStackCapacity, gas, &err)
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memory = make([]byte, memoryCapacity)
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ok = false // convenience
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)
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for {
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// If there is an error, return
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if err != nil {
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return nil, err
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}
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var op = codeGetOp(code, pc)
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dbg.Printf("(pc) %-3d (op) %-14s (st) %-4d ", pc, op.String(), stack.Len())
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switch op {
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case STOP: // 0x00
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return nil, nil
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case ADD: // 0x01
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x, y := stack.Pop(), stack.Pop()
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xb := new(big.Int).SetBytes(x[:])
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yb := new(big.Int).SetBytes(y[:])
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sum := new(big.Int).Add(xb, yb)
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res := LeftPadWord256(U256(sum).Bytes())
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stack.Push(res)
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dbg.Printf(" %v + %v = %v (%X)\n", xb, yb, sum, res)
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case MUL: // 0x02
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x, y := stack.Pop(), stack.Pop()
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xb := new(big.Int).SetBytes(x[:])
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yb := new(big.Int).SetBytes(y[:])
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prod := new(big.Int).Mul(xb, yb)
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res := LeftPadWord256(U256(prod).Bytes())
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stack.Push(res)
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dbg.Printf(" %v * %v = %v (%X)\n", xb, yb, prod, res)
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case SUB: // 0x03
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x, y := stack.Pop(), stack.Pop()
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xb := new(big.Int).SetBytes(x[:])
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yb := new(big.Int).SetBytes(y[:])
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diff := new(big.Int).Sub(xb, yb)
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res := LeftPadWord256(U256(diff).Bytes())
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stack.Push(res)
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dbg.Printf(" %v - %v = %v (%X)\n", xb, yb, diff, res)
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case DIV: // 0x04
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x, y := stack.Pop(), stack.Pop()
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if y.IsZero() {
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stack.Push(Zero256)
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dbg.Printf(" %x / %x = %v\n", x, y, 0)
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} else {
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xb := new(big.Int).SetBytes(x[:])
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yb := new(big.Int).SetBytes(y[:])
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div := new(big.Int).Div(xb, yb)
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res := LeftPadWord256(U256(div).Bytes())
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stack.Push(res)
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dbg.Printf(" %v / %v = %v (%X)\n", xb, yb, div, res)
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}
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case SDIV: // 0x05
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x, y := stack.Pop(), stack.Pop()
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if y.IsZero() {
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stack.Push(Zero256)
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dbg.Printf(" %x / %x = %v\n", x, y, 0)
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} else {
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xb := S256(new(big.Int).SetBytes(x[:]))
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yb := S256(new(big.Int).SetBytes(y[:]))
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div := new(big.Int).Div(xb, yb)
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res := LeftPadWord256(U256(div).Bytes())
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stack.Push(res)
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dbg.Printf(" %v / %v = %v (%X)\n", xb, yb, div, res)
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}
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case MOD: // 0x06
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x, y := stack.Pop(), stack.Pop()
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if y.IsZero() {
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stack.Push(Zero256)
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dbg.Printf(" %v %% %v = %v\n", x, y, 0)
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} else {
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xb := new(big.Int).SetBytes(x[:])
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yb := new(big.Int).SetBytes(y[:])
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mod := new(big.Int).Mod(xb, yb)
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res := LeftPadWord256(U256(mod).Bytes())
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stack.Push(res)
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dbg.Printf(" %v %% %v = %v (%X)\n", xb, yb, mod, res)
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}
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case SMOD: // 0x07
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x, y := stack.Pop(), stack.Pop()
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if y.IsZero() {
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stack.Push(Zero256)
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dbg.Printf(" %v %% %v = %v\n", x, y, 0)
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} else {
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xb := S256(new(big.Int).SetBytes(x[:]))
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yb := S256(new(big.Int).SetBytes(y[:]))
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mod := new(big.Int).Mod(xb, yb)
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res := LeftPadWord256(U256(mod).Bytes())
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stack.Push(res)
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dbg.Printf(" %v %% %v = %v (%X)\n", xb, yb, mod, res)
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}
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case ADDMOD: // 0x08
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x, y, z := stack.Pop(), stack.Pop(), stack.Pop()
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if z.IsZero() {
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stack.Push(Zero256)
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dbg.Printf(" %v %% %v = %v\n", x, y, 0)
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} else {
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xb := new(big.Int).SetBytes(x[:])
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yb := new(big.Int).SetBytes(y[:])
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zb := new(big.Int).SetBytes(z[:])
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add := new(big.Int).Add(xb, yb)
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mod := new(big.Int).Mod(add, zb)
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res := LeftPadWord256(U256(mod).Bytes())
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stack.Push(res)
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dbg.Printf(" %v + %v %% %v = %v (%X)\n",
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xb, yb, zb, mod, res)
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}
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case MULMOD: // 0x09
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x, y, z := stack.Pop(), stack.Pop(), stack.Pop()
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if z.IsZero() {
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stack.Push(Zero256)
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dbg.Printf(" %v %% %v = %v\n", x, y, 0)
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} else {
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xb := new(big.Int).SetBytes(x[:])
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yb := new(big.Int).SetBytes(y[:])
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zb := new(big.Int).SetBytes(z[:])
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mul := new(big.Int).Mul(xb, yb)
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mod := new(big.Int).Mod(mul, zb)
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res := LeftPadWord256(U256(mod).Bytes())
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stack.Push(res)
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dbg.Printf(" %v * %v %% %v = %v (%X)\n",
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xb, yb, zb, mod, res)
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}
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case EXP: // 0x0A
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x, y := stack.Pop(), stack.Pop()
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xb := new(big.Int).SetBytes(x[:])
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yb := new(big.Int).SetBytes(y[:])
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pow := new(big.Int).Exp(xb, yb, big.NewInt(0))
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res := LeftPadWord256(U256(pow).Bytes())
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stack.Push(res)
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dbg.Printf(" %v ** %v = %v (%X)\n", xb, yb, pow, res)
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case SIGNEXTEND: // 0x0B
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back := stack.Pop()
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backb := new(big.Int).SetBytes(back[:])
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if backb.Cmp(big.NewInt(31)) < 0 {
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bit := uint(backb.Uint64()*8 + 7)
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num := stack.Pop()
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numb := new(big.Int).SetBytes(num[:])
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mask := new(big.Int).Lsh(big.NewInt(1), bit)
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mask.Sub(mask, big.NewInt(1))
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if numb.Bit(int(bit)) == 1 {
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numb.Or(numb, mask.Not(mask))
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} else {
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numb.Add(numb, mask)
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}
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res := LeftPadWord256(U256(numb).Bytes())
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dbg.Printf(" = %v (%X)", numb, res)
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stack.Push(res)
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}
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case LT: // 0x10
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x, y := stack.Pop(), stack.Pop()
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xb := new(big.Int).SetBytes(x[:])
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yb := new(big.Int).SetBytes(y[:])
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if xb.Cmp(yb) < 0 {
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stack.Push64(1)
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dbg.Printf(" %v < %v = %v\n", xb, yb, 1)
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} else {
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stack.Push(Zero256)
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dbg.Printf(" %v < %v = %v\n", xb, yb, 0)
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}
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case GT: // 0x11
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x, y := stack.Pop(), stack.Pop()
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xb := new(big.Int).SetBytes(x[:])
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yb := new(big.Int).SetBytes(y[:])
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if xb.Cmp(yb) > 0 {
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stack.Push64(1)
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dbg.Printf(" %v > %v = %v\n", xb, yb, 1)
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} else {
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stack.Push(Zero256)
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dbg.Printf(" %v > %v = %v\n", xb, yb, 0)
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}
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case SLT: // 0x12
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x, y := stack.Pop(), stack.Pop()
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xb := S256(new(big.Int).SetBytes(x[:]))
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yb := S256(new(big.Int).SetBytes(y[:]))
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if xb.Cmp(yb) < 0 {
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stack.Push64(1)
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dbg.Printf(" %v < %v = %v\n", xb, yb, 1)
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} else {
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stack.Push(Zero256)
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dbg.Printf(" %v < %v = %v\n", xb, yb, 0)
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}
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case SGT: // 0x13
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x, y := stack.Pop(), stack.Pop()
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xb := S256(new(big.Int).SetBytes(x[:]))
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yb := S256(new(big.Int).SetBytes(y[:]))
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if xb.Cmp(yb) > 0 {
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stack.Push64(1)
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dbg.Printf(" %v > %v = %v\n", xb, yb, 1)
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} else {
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stack.Push(Zero256)
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dbg.Printf(" %v > %v = %v\n", xb, yb, 0)
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}
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case EQ: // 0x14
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x, y := stack.Pop(), stack.Pop()
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if bytes.Equal(x[:], y[:]) {
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stack.Push64(1)
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dbg.Printf(" %X == %X = %v\n", x, y, 1)
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} else {
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stack.Push(Zero256)
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dbg.Printf(" %X == %X = %v\n", x, y, 0)
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}
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case ISZERO: // 0x15
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x := stack.Pop()
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if x.IsZero() {
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stack.Push64(1)
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dbg.Printf(" %v == 0 = %v\n", x, 1)
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} else {
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stack.Push(Zero256)
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dbg.Printf(" %v == 0 = %v\n", x, 0)
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}
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case AND: // 0x16
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x, y := stack.Pop(), stack.Pop()
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z := [32]byte{}
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for i := 0; i < 32; i++ {
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z[i] = x[i] & y[i]
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}
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stack.Push(z)
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dbg.Printf(" %X & %X = %X\n", x, y, z)
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case OR: // 0x17
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x, y := stack.Pop(), stack.Pop()
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z := [32]byte{}
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for i := 0; i < 32; i++ {
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z[i] = x[i] | y[i]
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}
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stack.Push(z)
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dbg.Printf(" %X | %X = %X\n", x, y, z)
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case XOR: // 0x18
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x, y := stack.Pop(), stack.Pop()
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z := [32]byte{}
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for i := 0; i < 32; i++ {
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z[i] = x[i] ^ y[i]
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}
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stack.Push(z)
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dbg.Printf(" %X ^ %X = %X\n", x, y, z)
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case NOT: // 0x19
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x := stack.Pop()
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z := [32]byte{}
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for i := 0; i < 32; i++ {
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z[i] = ^x[i]
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}
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stack.Push(z)
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dbg.Printf(" !%X = %X\n", x, z)
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case BYTE: // 0x1A
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idx, val := stack.Pop64(), stack.Pop()
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res := byte(0)
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if idx < 32 {
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res = val[idx]
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}
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stack.Push64(int64(res))
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dbg.Printf(" => 0x%X\n", res)
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case SHA3: // 0x20
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if ok = useGas(gas, GasSha3); !ok {
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return nil, firstErr(err, ErrInsufficientGas)
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}
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offset, size := stack.Pop64(), stack.Pop64()
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data, ok := subslice(memory, offset, size)
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if !ok {
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return nil, firstErr(err, ErrMemoryOutOfBounds)
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}
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data = sha3.Sha3(data)
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stack.PushBytes(data)
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dbg.Printf(" => (%v) %X\n", size, data)
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case ADDRESS: // 0x30
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stack.Push(callee.Address)
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dbg.Printf(" => %X\n", callee.Address)
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case BALANCE: // 0x31
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addr := stack.Pop()
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if ok = useGas(gas, GasGetAccount); !ok {
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return nil, firstErr(err, ErrInsufficientGas)
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}
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acc := vm.appState.GetAccount(addr)
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if acc == nil {
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return nil, firstErr(err, ErrUnknownAddress)
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}
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balance := acc.Balance
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stack.Push64(balance)
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dbg.Printf(" => %v (%X)\n", balance, addr)
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case ORIGIN: // 0x32
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stack.Push(vm.origin)
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dbg.Printf(" => %X\n", vm.origin)
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case CALLER: // 0x33
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stack.Push(caller.Address)
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dbg.Printf(" => %X\n", caller.Address)
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case CALLVALUE: // 0x34
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stack.Push64(value)
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dbg.Printf(" => %v\n", value)
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case CALLDATALOAD: // 0x35
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offset := stack.Pop64()
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data, ok := subslice(input, offset, 32)
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if !ok {
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return nil, firstErr(err, ErrInputOutOfBounds)
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}
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res := LeftPadWord256(data)
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stack.Push(res)
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dbg.Printf(" => 0x%X\n", res)
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case CALLDATASIZE: // 0x36
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stack.Push64(int64(len(input)))
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dbg.Printf(" => %d\n", len(input))
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case CALLDATACOPY: // 0x37
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memOff := stack.Pop64()
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inputOff := stack.Pop64()
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length := stack.Pop64()
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data, ok := subslice(input, inputOff, length)
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if !ok {
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return nil, firstErr(err, ErrInputOutOfBounds)
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}
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dest, ok := subslice(memory, memOff, length)
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if !ok {
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return nil, firstErr(err, ErrMemoryOutOfBounds)
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}
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copy(dest, data)
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dbg.Printf(" => [%v, %v, %v] %X\n", memOff, inputOff, length, data)
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case CODESIZE: // 0x38
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l := int64(len(code))
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stack.Push64(l)
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dbg.Printf(" => %d\n", l)
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case CODECOPY: // 0x39
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memOff := stack.Pop64()
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codeOff := stack.Pop64()
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length := stack.Pop64()
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data, ok := subslice(code, codeOff, length)
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if !ok {
|
|
return nil, firstErr(err, ErrCodeOutOfBounds)
|
|
}
|
|
dest, ok := subslice(memory, memOff, length)
|
|
if !ok {
|
|
return nil, firstErr(err, ErrMemoryOutOfBounds)
|
|
}
|
|
copy(dest, data)
|
|
dbg.Printf(" => [%v, %v, %v] %X\n", memOff, codeOff, length, data)
|
|
|
|
case GASPRICE_DEPRECATED: // 0x3A
|
|
stack.Push(Zero256)
|
|
dbg.Printf(" => %X (GASPRICE IS DEPRECATED)\n")
|
|
|
|
case EXTCODESIZE: // 0x3B
|
|
addr := stack.Pop()
|
|
if ok = useGas(gas, GasGetAccount); !ok {
|
|
return nil, firstErr(err, ErrInsufficientGas)
|
|
}
|
|
acc := vm.appState.GetAccount(addr)
|
|
if acc == nil {
|
|
return nil, firstErr(err, ErrUnknownAddress)
|
|
}
|
|
code := acc.Code
|
|
l := int64(len(code))
|
|
stack.Push64(l)
|
|
dbg.Printf(" => %d\n", l)
|
|
|
|
case EXTCODECOPY: // 0x3C
|
|
addr := stack.Pop()
|
|
if ok = useGas(gas, GasGetAccount); !ok {
|
|
return nil, firstErr(err, ErrInsufficientGas)
|
|
}
|
|
acc := vm.appState.GetAccount(addr)
|
|
if acc == nil {
|
|
return nil, firstErr(err, ErrUnknownAddress)
|
|
}
|
|
code := acc.Code
|
|
memOff := stack.Pop64()
|
|
codeOff := stack.Pop64()
|
|
length := stack.Pop64()
|
|
data, ok := subslice(code, codeOff, length)
|
|
if !ok {
|
|
return nil, firstErr(err, ErrCodeOutOfBounds)
|
|
}
|
|
dest, ok := subslice(memory, memOff, length)
|
|
if !ok {
|
|
return nil, firstErr(err, ErrMemoryOutOfBounds)
|
|
}
|
|
copy(dest, data)
|
|
dbg.Printf(" => [%v, %v, %v] %X\n", memOff, codeOff, length, data)
|
|
|
|
case BLOCKHASH: // 0x40
|
|
stack.Push(Zero256)
|
|
dbg.Printf(" => 0x%X (NOT SUPPORTED)\n", stack.Peek().Bytes())
|
|
|
|
case COINBASE: // 0x41
|
|
stack.Push(Zero256)
|
|
dbg.Printf(" => 0x%X (NOT SUPPORTED)\n", stack.Peek().Bytes())
|
|
|
|
case TIMESTAMP: // 0x42
|
|
time := vm.params.BlockTime
|
|
stack.Push64(int64(time))
|
|
dbg.Printf(" => 0x%X\n", time)
|
|
|
|
case BLOCKHEIGHT: // 0x43
|
|
number := int64(vm.params.BlockHeight)
|
|
stack.Push64(number)
|
|
dbg.Printf(" => 0x%X\n", number)
|
|
|
|
case GASLIMIT: // 0x45
|
|
stack.Push64(vm.params.GasLimit)
|
|
dbg.Printf(" => %v\n", vm.params.GasLimit)
|
|
|
|
case POP: // 0x50
|
|
stack.Pop()
|
|
dbg.Printf(" => %v\n", vm.params.GasLimit)
|
|
|
|
case MLOAD: // 0x51
|
|
offset := stack.Pop64()
|
|
data, ok := subslice(memory, offset, 32)
|
|
if !ok {
|
|
return nil, firstErr(err, ErrMemoryOutOfBounds)
|
|
}
|
|
stack.Push(LeftPadWord256(data))
|
|
dbg.Printf(" => 0x%X\n", data)
|
|
|
|
case MSTORE: // 0x52
|
|
offset, data := stack.Pop64(), stack.Pop()
|
|
dest, ok := subslice(memory, offset, 32)
|
|
if !ok {
|
|
return nil, firstErr(err, ErrMemoryOutOfBounds)
|
|
}
|
|
copy(dest, data[:])
|
|
dbg.Printf(" => 0x%X\n", data)
|
|
|
|
case MSTORE8: // 0x53
|
|
offset, val := stack.Pop64(), byte(stack.Pop64()&0xFF)
|
|
if len(memory) <= int(offset) {
|
|
return nil, firstErr(err, ErrMemoryOutOfBounds)
|
|
}
|
|
memory[offset] = val
|
|
dbg.Printf(" => [%v] 0x%X\n", offset, val)
|
|
|
|
case SLOAD: // 0x54
|
|
loc := stack.Pop()
|
|
data := vm.appState.GetStorage(callee.Address, loc)
|
|
stack.Push(data)
|
|
dbg.Printf(" {0x%X : 0x%X}\n", loc, data)
|
|
|
|
case SSTORE: // 0x55
|
|
loc, data := stack.Pop(), stack.Pop()
|
|
vm.appState.SetStorage(callee.Address, loc, data)
|
|
useGas(gas, GasStorageUpdate)
|
|
dbg.Printf(" {0x%X : 0x%X}\n", loc, data)
|
|
|
|
case JUMP: // 0x56
|
|
err = jump(code, stack.Pop64(), &pc)
|
|
continue
|
|
|
|
case JUMPI: // 0x57
|
|
pos, cond := stack.Pop64(), stack.Pop()
|
|
if !cond.IsZero() {
|
|
err = jump(code, pos, &pc)
|
|
continue
|
|
}
|
|
dbg.Printf(" ~> false\n")
|
|
|
|
case PC: // 0x58
|
|
stack.Push64(pc)
|
|
|
|
case MSIZE: // 0x59
|
|
stack.Push64(int64(len(memory)))
|
|
|
|
case GAS: // 0x5A
|
|
stack.Push64(*gas)
|
|
dbg.Printf(" => %X\n", *gas)
|
|
|
|
case JUMPDEST: // 0x5B
|
|
dbg.Printf("\n")
|
|
// Do nothing
|
|
|
|
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:
|
|
a := int64(op - PUSH1 + 1)
|
|
codeSegment, ok := subslice(code, pc+1, a)
|
|
if !ok {
|
|
return nil, firstErr(err, ErrCodeOutOfBounds)
|
|
}
|
|
res := LeftPadWord256(codeSegment)
|
|
stack.Push(res)
|
|
pc += a
|
|
dbg.Printf(" => 0x%X\n", res)
|
|
//stack.Print(10)
|
|
|
|
case DUP1, DUP2, DUP3, DUP4, DUP5, DUP6, DUP7, DUP8, DUP9, DUP10, DUP11, DUP12, DUP13, DUP14, DUP15, DUP16:
|
|
n := int(op - DUP1 + 1)
|
|
stack.Dup(n)
|
|
dbg.Printf(" => [%d] 0x%X\n", n, stack.Peek().Bytes())
|
|
|
|
case SWAP1, SWAP2, SWAP3, SWAP4, SWAP5, SWAP6, SWAP7, SWAP8, SWAP9, SWAP10, SWAP11, SWAP12, SWAP13, SWAP14, SWAP15, SWAP16:
|
|
n := int(op - SWAP1 + 2)
|
|
stack.Swap(n)
|
|
dbg.Printf(" => [%d] %X\n", n, stack.Peek())
|
|
//stack.Print(10)
|
|
|
|
case LOG0, LOG1, LOG2, LOG3, LOG4:
|
|
n := int(op - LOG0)
|
|
topics := make([]Word256, n)
|
|
offset, size := stack.Pop64(), stack.Pop64()
|
|
for i := 0; i < n; i++ {
|
|
topics[i] = stack.Pop()
|
|
}
|
|
data, ok := subslice(memory, offset, size)
|
|
if !ok {
|
|
return nil, firstErr(err, ErrMemoryOutOfBounds)
|
|
}
|
|
log := &Log{
|
|
callee.Address,
|
|
topics,
|
|
data,
|
|
vm.params.BlockHeight,
|
|
}
|
|
vm.appState.AddLog(log)
|
|
dbg.Printf(" => %v\n", log)
|
|
|
|
case CREATE: // 0xF0
|
|
contractValue := stack.Pop64()
|
|
offset, size := stack.Pop64(), stack.Pop64()
|
|
input, ok := subslice(memory, offset, size)
|
|
if !ok {
|
|
return nil, firstErr(err, ErrMemoryOutOfBounds)
|
|
}
|
|
|
|
// Check balance
|
|
if callee.Balance < contractValue {
|
|
return nil, firstErr(err, ErrInsufficientBalance)
|
|
}
|
|
|
|
// TODO charge for gas to create account _ the code length * GasCreateByte
|
|
|
|
newAccount := vm.appState.CreateAccount(callee)
|
|
// Run the input to get the contract code.
|
|
ret, err_ := vm.Call(callee, newAccount, input, input, contractValue, gas)
|
|
if err_ != nil {
|
|
stack.Push(Zero256)
|
|
} else {
|
|
newAccount.Code = ret // Set the code
|
|
stack.Push(newAccount.Address)
|
|
}
|
|
|
|
case CALL, CALLCODE: // 0xF1, 0xF2
|
|
gasLimit := stack.Pop64()
|
|
addr, value := stack.Pop(), stack.Pop64()
|
|
inOffset, inSize := stack.Pop64(), stack.Pop64() // inputs
|
|
retOffset, retSize := stack.Pop64(), stack.Pop64() // outputs
|
|
dbg.Printf(" => %X\n", addr)
|
|
|
|
// Get the arguments from the memory
|
|
args, ok := subslice(memory, inOffset, inSize)
|
|
if !ok {
|
|
return nil, firstErr(err, ErrMemoryOutOfBounds)
|
|
}
|
|
|
|
// Ensure that gasLimit is reasonable
|
|
if *gas < gasLimit {
|
|
return nil, firstErr(err, ErrInsufficientGas)
|
|
} else {
|
|
*gas -= gasLimit
|
|
// NOTE: we will return any used gas later.
|
|
}
|
|
|
|
// Begin execution
|
|
var ret []byte
|
|
var err error
|
|
if nativeContract := nativeContracts[addr]; nativeContract != nil {
|
|
// Native contract
|
|
ret, err = nativeContract(args, &gasLimit)
|
|
} else {
|
|
// EVM contract
|
|
if ok = useGas(gas, GasGetAccount); !ok {
|
|
return nil, firstErr(err, ErrInsufficientGas)
|
|
}
|
|
acc := vm.appState.GetAccount(addr)
|
|
// since CALL is used also for sending funds,
|
|
// acc may not exist yet. This is an error for
|
|
// CALLCODE, but not for CALL, though I don't think
|
|
// ethereum actually cares
|
|
if op == CALLCODE {
|
|
if acc == nil {
|
|
return nil, firstErr(err, ErrUnknownAddress)
|
|
}
|
|
ret, err = vm.Call(callee, callee, acc.Code, args, value, gas)
|
|
} else {
|
|
if acc == nil {
|
|
// if we have not seen the account before, create it
|
|
// so we can send funds
|
|
acc = &Account{
|
|
Address: addr,
|
|
}
|
|
vm.appState.UpdateAccount(acc)
|
|
}
|
|
ret, err = vm.Call(callee, acc, acc.Code, args, value, gas)
|
|
}
|
|
}
|
|
|
|
// Push result
|
|
if err != nil {
|
|
dbg.Printf("error on call: %s", err.Error())
|
|
// TODO: fire event
|
|
stack.Push(Zero256)
|
|
} else {
|
|
stack.Push(One256)
|
|
dest, ok := subslice(memory, retOffset, retSize)
|
|
if !ok {
|
|
return nil, firstErr(err, ErrMemoryOutOfBounds)
|
|
}
|
|
copy(dest, ret)
|
|
}
|
|
|
|
// Handle remaining gas.
|
|
*gas += gasLimit
|
|
|
|
dbg.Printf("resume %X (%v)\n", callee.Address, gas)
|
|
|
|
case RETURN: // 0xF3
|
|
offset, size := stack.Pop64(), stack.Pop64()
|
|
ret, ok := subslice(memory, offset, size)
|
|
if !ok {
|
|
return nil, firstErr(err, ErrMemoryOutOfBounds)
|
|
}
|
|
dbg.Printf(" => [%v, %v] (%d) 0x%X\n", offset, size, len(ret), ret)
|
|
return ret, nil
|
|
|
|
case SUICIDE: // 0xFF
|
|
addr := stack.Pop()
|
|
if ok = useGas(gas, GasGetAccount); !ok {
|
|
return nil, firstErr(err, ErrInsufficientGas)
|
|
}
|
|
// TODO if the receiver is , then make it the fee.
|
|
receiver := vm.appState.GetAccount(addr)
|
|
if receiver == nil {
|
|
return nil, firstErr(err, ErrUnknownAddress)
|
|
}
|
|
balance := callee.Balance
|
|
receiver.Balance += balance
|
|
vm.appState.UpdateAccount(receiver)
|
|
vm.appState.RemoveAccount(callee)
|
|
dbg.Printf(" => (%X) %v\n", addr[:4], balance)
|
|
fallthrough
|
|
|
|
default:
|
|
dbg.Printf("(pc) %-3v Invalid opcode %X\n", pc, op)
|
|
return nil, fmt.Errorf("Invalid opcode %X", op)
|
|
}
|
|
|
|
pc++
|
|
|
|
}
|
|
}
|
|
|
|
func subslice(data []byte, offset, length int64) (ret []byte, ok bool) {
|
|
size := int64(len(data))
|
|
if size < offset {
|
|
return nil, false
|
|
} else if size < offset+length {
|
|
ret, ok = data[offset:], true
|
|
ret = RightPadBytes(ret, 32)
|
|
} else {
|
|
ret, ok = data[offset:offset+length], true
|
|
}
|
|
|
|
return
|
|
}
|
|
|
|
func rightMostBytes(data []byte, n int) []byte {
|
|
size := MinInt(len(data), n)
|
|
offset := len(data) - size
|
|
return data[offset:]
|
|
}
|
|
|
|
func codeGetOp(code []byte, n int64) OpCode {
|
|
if int64(len(code)) <= n {
|
|
return OpCode(0) // stop
|
|
} else {
|
|
return OpCode(code[n])
|
|
}
|
|
}
|
|
|
|
func jump(code []byte, to int64, pc *int64) (err error) {
|
|
dest := codeGetOp(code, to)
|
|
if dest != JUMPDEST {
|
|
dbg.Printf(" ~> %v invalid jump dest %v\n", to, dest)
|
|
return ErrInvalidJumpDest
|
|
}
|
|
dbg.Printf(" ~> %v\n", to)
|
|
*pc = to
|
|
return nil
|
|
}
|
|
|
|
func firstErr(errA, errB error) error {
|
|
if errA != nil {
|
|
return errA
|
|
} else {
|
|
return errB
|
|
}
|
|
}
|
|
|
|
func useGas(gas *int64, gasToUse int64) bool {
|
|
if *gas > gasToUse {
|
|
*gas -= gasToUse
|
|
return true
|
|
} else {
|
|
return false
|
|
}
|
|
}
|
|
|
|
func transfer(from, to *Account, amount int64) error {
|
|
if from.Balance < amount {
|
|
return ErrInsufficientBalance
|
|
} else {
|
|
from.Balance -= amount
|
|
to.Balance += amount
|
|
return nil
|
|
}
|
|
}
|