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core/vm: Improved error reporting for trace logging

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This commit is contained in:
obscuren 2015-06-12 13:35:14 +02:00
parent 02d629af8f
commit 287f990891
4 changed files with 49 additions and 50 deletions
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1
core/vm/environment.go
View File

@ -45,6 +45,7 @@ type StructLog struct {
Memory []byte
Stack []*big.Int
Storage map[common.Hash][]byte
Err error
}
type Account interface {

12
core/vm/errors.go
View File

@ -2,20 +2,14 @@ package vm
import (
"fmt"
"github.com/ethereum/go-ethereum/params"
"math/big"
)
type OutOfGasError struct {
req, has *big.Int
}
func OOG(req, has *big.Int) OutOfGasError {
return OutOfGasError{req, has}
}
type OutOfGasError struct{}
func (self OutOfGasError) Error() string {
return fmt.Sprintf("out of gas! require %v, have %v", self.req, self.has)
return "Out Of Gas"
}
func IsOOGErr(err error) bool {

9
core/vm/logger.go
View File

@ -9,9 +9,14 @@ import (
)
func StdErrFormat(logs []StructLog) {
fmt.Fprintf(os.Stderr, "VM Stats %d ops\n", len(logs))
fmt.Fprintf(os.Stderr, "VM STAT %d OPs\n", len(logs))
for _, log := range logs {
fmt.Fprintf(os.Stderr, "PC %08d: %s GAS: %v COST: %v\n", log.Pc, log.Op, log.Gas, log.GasCost)
fmt.Fprintf(os.Stderr, "PC %08d: %s GAS: %v COST: %v", log.Pc, log.Op, log.Gas, log.GasCost)
if log.Err != nil {
fmt.Fprintf(os.Stderr, " ERROR: %v", log.Err)
}
fmt.Fprintf(os.Stderr, "\n")
fmt.Fprintln(os.Stderr, "STACK =", len(log.Stack))
for i := len(log.Stack) - 1; i >= 0; i-- {

77
core/vm/vm.go
View File

@ -43,35 +43,7 @@ func (self *Vm) Run(context *Context, input []byte) (ret []byte, err error) {
code = context.Code
value = context.value
price = context.Price
)
// User defer pattern to check for an error and, based on the error being nil or not, use all gas and return.
defer func() {
if self.After != nil {
self.After(context, err)
}
if err != nil {
// In case of a VM exception (known exceptions) all gas consumed (panics NOT included).
context.UseGas(context.Gas)
ret = context.Return(nil)
}
}()
if context.CodeAddr != nil {
if p := Precompiled[context.CodeAddr.Str()]; p != nil {
return self.RunPrecompiled(p, input, context)
}
}
// Don't bother with the execution if there's no code.
if len(code) == 0 {
return context.Return(nil), nil
}
var (
op OpCode // current opcode
codehash = crypto.Sha3Hash(code) // codehash is used when doing jump dest caching
mem = NewMemory() // bound memory
@ -93,8 +65,38 @@ func (self *Vm) Run(context *Context, input []byte) (ret []byte, err error) {
return nil
}
newMemSize *big.Int
cost *big.Int
)
// User defer pattern to check for an error and, based on the error being nil or not, use all gas and return.
defer func() {
if self.After != nil {
self.After(context, err)
}
if err != nil {
self.log(pc, op, context.Gas, cost, mem, stack, context, err)
// In case of a VM exception (known exceptions) all gas consumed (panics NOT included).
context.UseGas(context.Gas)
ret = context.Return(nil)
}
}()
if context.CodeAddr != nil {
if p := Precompiled[context.CodeAddr.Str()]; p != nil {
return self.RunPrecompiled(p, input, context)
}
}
// Don't bother with the execution if there's no code.
if len(code) == 0 {
return context.Return(nil), nil
}
for {
// The base for all big integer arithmetic
base := new(big.Int)
@ -103,24 +105,23 @@ func (self *Vm) Run(context *Context, input []byte) (ret []byte, err error) {
op = context.GetOp(pc)
// calculate the new memory size and gas price for the current executing opcode
newMemSize, gas, err := self.calculateGasAndSize(context, caller, op, statedb, mem, stack)
newMemSize, cost, err = self.calculateGasAndSize(context, caller, op, statedb, mem, stack)
if err != nil {
return nil, err
}
self.log(pc, op, context.Gas, gas, mem, stack, context)
// Use the calculated gas. When insufficient gas is present, use all gas and return an
// Out Of Gas error
if !context.UseGas(gas) {
tmp := new(big.Int).Set(context.Gas)
if !context.UseGas(cost) {
context.UseGas(context.Gas)
return context.Return(nil), OOG(gas, tmp)
return context.Return(nil), OutOfGasError{}
}
// Resize the memory calculated previously
mem.Resize(newMemSize.Uint64())
// Add a log message
self.log(pc, op, context.Gas, cost, mem, stack, context, nil)
switch op {
case ADD:
@ -783,15 +784,13 @@ func (self *Vm) RunPrecompiled(p *PrecompiledAccount, input []byte, context *Con
return context.Return(ret), nil
} else {
tmp := new(big.Int).Set(context.Gas)
return nil, OOG(gas, tmp)
return nil, OutOfGasError{}
}
}
// log emits a log event to the environment for each opcode encountered. This is not to be confused with the
// LOG* opcode.
func (self *Vm) log(pc uint64, op OpCode, gas, cost *big.Int, memory *Memory, stack *stack, context *Context) {
func (self *Vm) log(pc uint64, op OpCode, gas, cost *big.Int, memory *Memory, stack *stack, context *Context, err error) {
if Debug {
mem := make([]byte, len(memory.Data()))
copy(mem, memory.Data())
@ -804,7 +803,7 @@ func (self *Vm) log(pc uint64, op OpCode, gas, cost *big.Int, memory *Memory, st
storage[common.BytesToHash(k)] = v
})
self.env.AddStructLog(StructLog{pc, op, new(big.Int).Set(gas), cost, mem, stck, storage})
self.env.AddStructLog(StructLog{pc, op, new(big.Int).Set(gas), cost, mem, stck, storage, err})
}
}