From 0c40df5f28b70b4aafee526bed7575520f3b827b Mon Sep 17 00:00:00 2001
From: Sina Mahmoodi <1591639+s1na@users.noreply.github.com>
Date: Tue, 1 Nov 2022 16:55:44 +0330
Subject: [PATCH] eth/tracers: prestateTracer - exclude unchanged storage slots
 in diffMode (#25944)

Fixes #25943
---
 .../inner_create.json                         | 68 +------------------
 .../simple.json                               |  3 -
 eth/tracers/native/prestate.go                | 11 +--
 3 files changed, 9 insertions(+), 73 deletions(-)

diff --git a/eth/tracers/internal/tracetest/testdata/prestate_tracer_with_diff_mode/inner_create.json b/eth/tracers/internal/tracetest/testdata/prestate_tracer_with_diff_mode/inner_create.json
index 5bcf5121f1..9c0030a0a8 100644
--- a/eth/tracers/internal/tracetest/testdata/prestate_tracer_with_diff_mode/inner_create.json
+++ b/eth/tracers/internal/tracetest/testdata/prestate_tracer_with_diff_mode/inner_create.json
@@ -214,90 +214,28 @@
         "nonce": 237,
         "code": "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"0x606060405236156101a05760e060020a60003504630924120081146101c25780630a16697a146101cf5780630fd1f94e146101d8578063137c638b1461022e57806321835af61461023b57806324032866146102545780632f95b833146102d65780633017fe24146102e55780633233c686146102ef57806337f4c00e146102fa5780634500054f146103055780634e417a98146103785780634e71d92d146103e15780634f059a43146103f35780636146195414610451578063625cc4651461046157806367ce940d1461046a5780637d298ee314610477578063830953ab146104f9578063938b5f321461050457806395ee122114610516578063974654f41461052a578063a06db7dc14610535578063a9d2293d14610541578063ae45850b14610597578063b0f07e44146105a9578063c19d93fb146105cb578063c6502da81461062e578063c680362214610637578063ca94692d1461064a578063cc3471af14610673578063d379be23146106c9578063d62457f6146106e3578063ea8a1af0146106ee578063f5562753146107f3578063f6b4dfb414610854575b610868600080548190600160a060020a03908116339091161461087a57610994565b610868600b5460ff165b90565b610868600d5481565b6108686000731deeda36e15ec9e80f3d7414d67a4803ae45fc80630fd1f94e6040518160e060020a02815260040180905060206040518083038160008760325a03f2156100025750506040515191506101cc9050565b6108685b62012cc86101cc565b61086860043560008160001415610dc65750600161084f565b6108686004356024356000731deeda36e15ec9e80f3d7414d67a4803ae45fc80630bd295e6600360005085856040518460e060020a0281526004018084815260200183600160a060020a03168152602001828152602001935050505060206040518083038160008760325a03f215610002575050604051519150505b92915050565b61099860085461ffff166101cc565b61086860026101cc565b610868600a546101cc565b6108686006546101cc565b6108686000731deeda36e15ec9e80f3d7414d67a4803ae45fc8063a09431546003600050336040518360e060020a0281526004018083815260200182600160a060020a031681526020019250505060206040518083038160008760325a03f2156100025750506040515191506101cc9050565b6109af60408051602081810183526000825282516004805460026001821615610100026000190190911604601f81018490048402830184019095528482529293909291830182828015610a7d5780601f10610a5257610100808354040283529160200191610a7d565b61086860006000600180610b7b6105cf565b6108686000731deeda36e15ec9e80f3d7414d67a4803ae45fc8063f5562753436040518260e060020a0281526004018082815260200191505060206040518083038160008760325a03f2156100025750506040515191506101cc9050565b610a1d6000600480610c986105cf565b61086860025481565b6108685b620186a06101cc565b6108686004356024355b6000731deeda36e15ec9e80f3d7414d67a4803ae45fc8063a1873db6600360005085856040518460e060020a0281526004018084815260200183600160a060020a03168152602001828152602001935050505060206040518083038160008760325a03f2156100025750506040515191506102d09050565b6108686009546101cc565b610a1f600c54600160a060020a031681565b610868600b5462010000900460ff166101cc565b6108686007546101cc565b610a3c600e5460ff1681565b6108686000731deeda36e15ec9e80f3d7414d67a4803ae45fc8063a9d2293d6040518160e060020a02815260040180905060206040518083038160008760325a03f2156100025750506040515191506101cc9050565b610a1f600054600160a060020a031681565b610868600080548190600160a060020a039081163390911614610a8957610994565b6108685b6000731deeda36e15ec9e80f3d7414d67a4803ae45fc80635054d98a60036000506040518260e060020a0281526004018082815260200191505060206040518083038160008760325a03f2156100025750506040515191506101cc9050565b61086860015481565b610868600b54610100900460ff166101cc565b61086860035474010000000000000000000000000000000000000000900460e060020a026101cc565b6108686000731deeda36e15ec9e80f3d7414d67a4803ae45fc8063cc3471af6040518160e060020a02815260040180905060206040518083038160008760325a03f2156100025750506040515191506101cc9050565b610a1f600854620100009004600160a060020a03166101cc565b6108686005546101cc565b610a1d604080517fa09431540000000000000000000000000000000000000000000000000000000081526003600482015233600160a060020a031660248201529051731deeda36e15ec9e80f3d7414d67a4803ae45fc809163a0943154916044808301926020929190829003018160008760325a03f215610002575050604051511590506107f157604080517f7e9265620000000000000000000000000000000000000000000000000000000081526003600482015233600160a060020a031660248201529051731deeda36e15ec9e80f3d7414d67a4803ae45fc8091637e9265629160448083019260009291908290030181838760325a03f215610002575050505b565b6108686004356000731deeda36e15ec9e80f3d7414d67a4803ae45fc8063f5562753836040518260e060020a0281526004018082815260200191505060206040518083038160008760325a03f215610002575050604051519150505b919050565b610a1f600354600160a060020a03166101cc565b60408051918252519081900360200190f35b60045460006002600183161561010002600019019092169190910411156108a45760009150610994565b6108ac6105cf565b9050600081141580156108c0575060018114155b80156108cd575060028114155b156108db5760009150610994565b600480546000828152602060026001841615610100026000190190931692909204601f908101929092047f8a35acfbc15ff81a39ae7d344fd709f28e8600b4aa8c65c6b64bfe7fe36bd19b9081019236929083901061095d5782800160ff198235161785555b5061098d9291505b808211156109945760008155600101610949565b82800160010185558215610941579182015b8281111561094157823582600050559160200191906001019061096f565b5050600191505b5090565b6040805161ffff9092168252519081900360200190f35b6040518080602001828103825283818151815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       },
       "0x7dd677b54fc954824a7bc49bd26cbdfa12c75adf": {
         "balance": "0xd7a58f5b73b4b6c4",
         "code": "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",
         "storage": {
-          "0x0000000000000000000000000000000000000000000000000000000000000000": "0x0000000000000000000000000000000000000000000000000000000056be5b99",
           "0x0000000000000000000000000000000000000000000000000000000000000001": "0x0000000000000000000000000000000000000000000000000000000056d0009b",
           "0x0000000000000000000000000000000000000000000000000000000000000002": "0x000000000000000000000000000000000000000000000000000000000000008b",
-          "0x0000000000000000000000000000000000000000000000000000000000000003": "0x0000000000000000000000006c8f2a135f6ed072de4503bd7c4999a1a17f824b",
-          "0x0000000000000000000000000000000000000000000000000000000000000004": "0x000000000000000000000000741467b251fca923d6229c4b439078b55dca233b",
-          "0x0000000000000000000000000000000000000000000000000000000000000005": "0x0000000000000000000001e0d3cda913deb6f67967b99d67acdfa1712c293601"
+          "0x0000000000000000000000000000000000000000000000000000000000000004": "0x000000000000000000000000741467b251fca923d6229c4b439078b55dca233b"
         }
       },
       "0xb834e3edfc1a927bdcecb67a9d0eccbd752a5bb3": {
diff --git a/eth/tracers/internal/tracetest/testdata/prestate_tracer_with_diff_mode/simple.json b/eth/tracers/internal/tracetest/testdata/prestate_tracer_with_diff_mode/simple.json
index 4fd7df37a9..01cc3c5058 100644
--- a/eth/tracers/internal/tracetest/testdata/prestate_tracer_with_diff_mode/simple.json
+++ b/eth/tracers/internal/tracetest/testdata/prestate_tracer_with_diff_mode/simple.json
@@ -73,9 +73,6 @@
         "nonce": 1,
         "code": "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",
         "storage": {
-          "0x0000000000000000000000000000000000000000000000000000000000000000": "0x000000000000000000000001b436ba50d378d4bbc8660d312a13df6af6e89dfb",
-          "0x0000000000000000000000000000000000000000000000000000000000000001": "0x00000000000000000000000000000000000000000000000006f05b59d3b20000",
-          "0x0000000000000000000000000000000000000000000000000000000000000002": "0x000000000000000000000000000000000000000000000000000000000000003c",
           "0x0000000000000000000000000000000000000000000000000000000000000003": "0x000000000000000000000000000000000000000000000000000000005a37b834"
         }
       },
diff --git a/eth/tracers/native/prestate.go b/eth/tracers/native/prestate.go
index f06ca80598..9562bb01ca 100644
--- a/eth/tracers/native/prestate.go
+++ b/eth/tracers/native/prestate.go
@@ -69,12 +69,10 @@ type prestateTracer struct {
 }
 
 type prestateTracerConfig struct {
-	DiffMode bool `json:"diffMode"` // If true, this tracer will return all diff states
+	DiffMode bool `json:"diffMode"` // If true, this tracer will return state modifications
 }
 
 func newPrestateTracer(ctx *tracers.Context, cfg json.RawMessage) (tracers.Tracer, error) {
-	// First callframe contains tx context info
-	// and is populated on start and end.
 	var config prestateTracerConfig
 	if cfg != nil {
 		if err := json.Unmarshal(cfg, &config); err != nil {
@@ -192,7 +190,7 @@ func (t *prestateTracer) CaptureTxEnd(restGas uint64) {
 	}
 
 	for addr, state := range t.pre {
-		// the deleted account's state is pruned
+		// The deleted account's state is pruned from `post` but kept in `pre`
 		if _, ok := t.deleted[addr]; ok {
 			continue
 		}
@@ -222,7 +220,10 @@ func (t *prestateTracer) CaptureTxEnd(restGas uint64) {
 			}
 
 			newVal := t.env.StateDB.GetState(addr, key)
-			if val != newVal {
+			if val == newVal {
+				// Omit unchanged slots
+				delete(t.pre[addr].Storage, key)
+			} else {
 				modified = true
 				if newVal != (common.Hash{}) {
 					postAccount.Storage[key] = newVal