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This commit is contained in:
Sina Mahmoodi 2025-09-25 14:46:40 +02:00
parent cf80c3754a
commit 87b7bd2f31
1 changed files with 14 additions and 13 deletions
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27
eth/tracers/native/keccak256_preimage.go
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@ -31,18 +31,19 @@ import (
)
func init() {
tracers.DefaultDirectory.Register("keccak256PreimageTracer", newKeccak256preimageTracer, false)
tracers.DefaultDirectory.Register("keccak256PreimageTracer", newKeccak256PreimageTracer, false)
}
// keccak256preimageTracer is a native tracer that will collect preimages of all keccak256 calls.
// It is mostly useful paired with the prestate tracer, enabling users to decypher the access to mappings and arrays.
type keccak256preimageTracer struct {
// keccak256PreimageTracer is a native tracer that collects preimages of all KECCAK256 operations.
// This tracer is particularly useful for analyzing smart contract execution patterns,
// especially when debugging storage access in Solidity mappings and dynamic arrays.
type keccak256PreimageTracer struct {
computedHashes map[common.Hash]hexutil.Bytes
}
// newKeccak256preimageTracer returns a new keccak256preimage tracer.
func newKeccak256preimageTracer(ctx *tracers.Context, cfg json.RawMessage, chainConfig *params.ChainConfig) (*tracers.Tracer, error) {
t := &keccak256preimageTracer{
// newKeccak256PreimageTracer returns a new keccak256PreimageTracer instance.
func newKeccak256PreimageTracer(ctx *tracers.Context, cfg json.RawMessage, chainConfig *params.ChainConfig) (*tracers.Tracer, error) {
t := &keccak256PreimageTracer{
computedHashes: make(map[common.Hash]hexutil.Bytes),
}
return &tracers.Tracer{
@ -53,7 +54,7 @@ func newKeccak256preimageTracer(ctx *tracers.Context, cfg json.RawMessage, chain
}, nil
}
func (t *keccak256preimageTracer) OnOpcode(pc uint64, op byte, gas, cost uint64, scope tracing.OpContext, rData []byte, depth int, err error) {
func (t *keccak256PreimageTracer) OnOpcode(pc uint64, op byte, gas, cost uint64, scope tracing.OpContext, rData []byte, depth int, err error) {
if op == byte(vm.KECCAK256) {
sd := scope.StackData()
// it turns out that sometimes the stack is empty, evm will fail in this case, but we should not panic here
@ -61,11 +62,11 @@ func (t *keccak256preimageTracer) OnOpcode(pc uint64, op byte, gas, cost uint64,
return
}
dataOffset := peepStack(sd, 0).Uint64()
dataLength := peepStack(sd, 1).Uint64()
dataOffset := internal.StackBack(sd, 0).Uint64()
dataLength := internal.StackBack(sd, 1).Uint64()
preimage, err := internal.GetMemoryCopyPadded(scope.MemoryData(), int64(dataOffset), int64(dataLength))
if err != nil {
log.Warn("erc7562Tracer: failed to copy keccak preimage from memory", "err", err)
log.Warn("keccak256PreimageTracer: failed to copy keccak preimage from memory", "err", err)
return
}
@ -75,8 +76,8 @@ func (t *keccak256preimageTracer) OnOpcode(pc uint64, op byte, gas, cost uint64,
}
}
// GetResult returns an empty json object.
func (t *keccak256preimageTracer) GetResult() (json.RawMessage, error) {
// GetResult returns the collected keccak256 preimages as a JSON object mapping hashes to preimages.
func (t *keccak256PreimageTracer) GetResult() (json.RawMessage, error) {
msg, err := json.Marshal(t.computedHashes)
if err != nil {
return nil, err