blob: 50f0f0fadd712448ae8096cd5e5ebd8ce860a4e5 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
|
import * as ethUtil from 'ethereumjs-util';
import * as _ from 'lodash';
import * as Constants from '../utils/constants';
import { EncodingRules } from '../utils/rules';
import * as CalldataBlocks from './blocks';
import { CalldataBlock } from './calldata_block';
import { CalldataIterator, ReverseCalldataIterator } from './iterator';
export class Calldata {
private readonly _rules: EncodingRules;
private _selector: string;
private _sizeInBytes: number;
private _root: CalldataBlock | undefined;
public constructor(rules: EncodingRules) {
this._rules = rules;
this._selector = '';
this._sizeInBytes = 0;
this._root = undefined;
}
public optimize(): void {
if (this._root === undefined) {
throw new Error('expected root');
}
const blocksByHash: { [key: string]: CalldataBlock } = {};
// 1. Create a queue of subtrees by hash
// Note that they are ordered the same as
const iterator = new ReverseCalldataIterator(this._root);
for (const block of iterator) {
if (block instanceof CalldataBlocks.Pointer) {
const dependencyBlockHashBuf = block.getDependency().computeHash();
const dependencyBlockHash = ethUtil.bufferToHex(dependencyBlockHashBuf);
if (dependencyBlockHash in blocksByHash) {
const blockWithSameHash = blocksByHash[dependencyBlockHash];
if (blockWithSameHash !== block.getDependency()) {
block.setAlias(blockWithSameHash);
}
}
continue;
}
const blockHashBuf = block.computeHash();
const blockHash = ethUtil.bufferToHex(blockHashBuf);
if (!(blockHash in blocksByHash)) {
blocksByHash[blockHash] = block;
}
}
}
public toHexString(): string {
if (this._root === undefined) {
throw new Error('expected root');
}
if (this._rules.optimize) {
this.optimize();
}
const iterator = new CalldataIterator(this._root);
let offset = 0;
for (const block of iterator) {
block.setOffset(offset);
offset += block.getSizeInBytes();
}
const hexValue = this._rules.annotate ? this._generateAnnotatedHexString() : this._generateCondensedHexString();
return hexValue;
}
public getSelectorHex(): string {
return this._selector;
}
public getSizeInBytes(): number {
return this._sizeInBytes;
}
public setRoot(block: CalldataBlock): void {
this._root = block;
this._sizeInBytes += block.getSizeInBytes();
}
public setSelector(selector: string): void {
this._selector = selector.startsWith('0x') ? selector : `$0x${selector}`;
if (this._selector.length !== Constants.HEX_SELECTOR_LENGTH_IN_CHARS) {
throw new Error(`Invalid selector '${this._selector}'`);
}
this._sizeInBytes += Constants.HEX_SELECTOR_LENGTH_IN_BYTES; // @TODO: Used to be += 8. Bad?
}
private _generateAnnotatedHexString(): string {
let hexValue = `${this._selector}`;
if (this._root === undefined) {
throw new Error('expected root');
}
const iterator = new CalldataIterator(this._root);
let offset = 0;
const functionName: string = this._root.getName();
for (const block of iterator) {
// Process each block 1 word at a time
const size = block.getSizeInBytes();
const name = block.getName();
const parentName = block.getParentName();
const prettyName = name.replace(`${parentName}.`, '').replace(`${functionName}.`, '');
// Current offset
let offsetStr = '';
// If this block is empty then it's a newline
const offsetPadding = 10;
const valuePadding = 74;
const namePadding = 80;
const evmWordStartIndex = 0;
const emptySize = 0;
let value = '';
let nameStr = '';
let line = '';
if (size === emptySize) {
offsetStr = ' '.repeat(offsetPadding);
value = ' '.repeat(valuePadding);
nameStr = `### ${prettyName.padEnd(namePadding)}`;
line = `\n${offsetStr}${value}${nameStr}`;
} else {
offsetStr = `0x${offset.toString(Constants.HEX_BASE)}`.padEnd(offsetPadding);
value = ethUtil
.stripHexPrefix(
ethUtil.bufferToHex(
block.toBuffer().slice(evmWordStartIndex, Constants.EVM_WORD_WIDTH_IN_BYTES),
),
)
.padEnd(valuePadding);
if (block instanceof CalldataBlocks.Set) {
nameStr = `### ${prettyName.padEnd(namePadding)}`;
line = `\n${offsetStr}${value}${nameStr}`;
} else {
nameStr = ` ${prettyName.padEnd(namePadding)}`;
line = `${offsetStr}${value}${nameStr}`;
}
}
for (let j = Constants.EVM_WORD_WIDTH_IN_BYTES; j < size; j += Constants.EVM_WORD_WIDTH_IN_BYTES) {
offsetStr = `0x${(offset + j).toString(Constants.HEX_BASE)}`.padEnd(offsetPadding);
value = ethUtil
.stripHexPrefix(
ethUtil.bufferToHex(block.toBuffer().slice(j, j + Constants.EVM_WORD_WIDTH_IN_BYTES)),
)
.padEnd(valuePadding);
nameStr = ' '.repeat(namePadding);
line = `${line}\n${offsetStr}${value}${nameStr}`;
}
// Append to hex value
hexValue = `${hexValue}\n${line}`;
offset += size;
}
return hexValue;
}
private _generateCondensedHexString(): string {
const selectorBuffer = ethUtil.toBuffer(this._selector);
if (this._root === undefined) {
throw new Error('expected root');
}
const iterator = new CalldataIterator(this._root);
const valueBufs: Buffer[] = [selectorBuffer];
for (const block of iterator) {
valueBufs.push(block.toBuffer());
}
const combinedBuffers = Buffer.concat(valueBufs);
const hexValue = ethUtil.bufferToHex(combinedBuffers);
return hexValue;
}
}
|
