forked from cerc-io/plugeth
vm, ethapi: add limit
option to traceTransaction
that specifies the maximum number of elements in the `structLogs` output. This option is useful for debugging a transaction that involves a large number of repetition. For example, ``` debug.traceTransaction(tx, {disableStorage: true, limit: 2}) ``` shows at most the first two steps in the `structLogs`.
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b4cc8cbac4
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@ -26,3 +26,4 @@ import (
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var OutOfGasError = errors.New("Out of gas")
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var CodeStoreOutOfGasError = errors.New("Contract creation code storage out of gas")
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var DepthError = fmt.Errorf("Max call depth exceeded (%d)", params.CallCreateDepth)
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var TraceLimitReachedError = errors.New("The number of logs reached the specified limit")
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@ -42,6 +42,7 @@ type LogConfig struct {
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DisableStack bool // disable stack capture
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DisableStorage bool // disable storage capture
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FullStorage bool // show full storage (slow)
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Limit int // maximum length of output, but zero means unlimited
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}
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// StructLog is emitted to the Environment each cycle and lists information about the current internal state
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@ -64,7 +65,7 @@ type StructLog struct {
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// Note that reference types are actual VM data structures; make copies
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// if you need to retain them beyond the current call.
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type Tracer interface {
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CaptureState(env Environment, pc uint64, op OpCode, gas, cost *big.Int, memory *Memory, stack *Stack, contract *Contract, depth int, err error)
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CaptureState(env Environment, pc uint64, op OpCode, gas, cost *big.Int, memory *Memory, stack *Stack, contract *Contract, depth int, err error) error
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}
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// StructLogger is an EVM state logger and implements Tracer.
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@ -93,7 +94,12 @@ func NewStructLogger(cfg *LogConfig) *StructLogger {
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// captureState logs a new structured log message and pushes it out to the environment
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//
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// captureState also tracks SSTORE ops to track dirty values.
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func (l *StructLogger) CaptureState(env Environment, pc uint64, op OpCode, gas, cost *big.Int, memory *Memory, stack *Stack, contract *Contract, depth int, err error) {
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func (l *StructLogger) CaptureState(env Environment, pc uint64, op OpCode, gas, cost *big.Int, memory *Memory, stack *Stack, contract *Contract, depth int, err error) error {
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// check if already accumulated the specified number of logs
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if l.cfg.Limit != 0 && l.cfg.Limit <= len(l.logs) {
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return TraceLimitReachedError
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}
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// initialise new changed values storage container for this contract
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// if not present.
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if l.changedValues[contract.Address()] == nil {
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@ -152,6 +158,7 @@ func (l *StructLogger) CaptureState(env Environment, pc uint64, op OpCode, gas,
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log := StructLog{pc, op, new(big.Int).Set(gas), cost, mem, stck, storage, env.Depth(), err}
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l.logs = append(l.logs, log)
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return nil
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}
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// StructLogs returns a list of captured log entries
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@ -183,7 +183,10 @@ func (evm *EVM) Run(contract *Contract, input []byte) (ret []byte, err error) {
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mem.Resize(newMemSize.Uint64())
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// Add a log message
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if evm.cfg.Debug {
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evm.cfg.Tracer.CaptureState(evm.env, pc, op, contract.Gas, cost, mem, stack, contract, evm.env.Depth(), nil)
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err = evm.cfg.Tracer.CaptureState(evm.env, pc, op, contract.Gas, cost, mem, stack, contract, evm.env.Depth(), nil)
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if err != nil {
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return nil, err
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}
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}
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if opPtr := evm.jumpTable[op]; opPtr.valid {
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@ -278,7 +278,7 @@ func wrapError(context string, err error) error {
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}
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// CaptureState implements the Tracer interface to trace a single step of VM execution
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func (jst *JavascriptTracer) CaptureState(env vm.Environment, pc uint64, op vm.OpCode, gas, cost *big.Int, memory *vm.Memory, stack *vm.Stack, contract *vm.Contract, depth int, err error) {
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func (jst *JavascriptTracer) CaptureState(env vm.Environment, pc uint64, op vm.OpCode, gas, cost *big.Int, memory *vm.Memory, stack *vm.Stack, contract *vm.Contract, depth int, err error) error {
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if jst.err == nil {
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jst.memory.memory = memory
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jst.stack.stack = stack
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@ -301,6 +301,7 @@ func (jst *JavascriptTracer) CaptureState(env vm.Environment, pc uint64, op vm.O
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jst.err = wrapError("step", err)
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}
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}
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return nil
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}
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// GetResult calls the Javascript 'result' function and returns its value, or any accumulated error
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