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
|
/*
This file is part of solidity.
solidity is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
solidity is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with solidity. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* Parser for Yul code and data object container.
*/
#include <libyul/ObjectParser.h>
#include <libyul/AsmParser.h>
#include <libyul/Exceptions.h>
#include <liblangutil/Token.h>
using namespace dev;
using namespace langutil;
using namespace yul;
using namespace std;
shared_ptr<Object> ObjectParser::parse(shared_ptr<Scanner> const& _scanner, bool _reuseScanner)
{
m_recursionDepth = 0;
try
{
shared_ptr<Object> object;
m_scanner = _scanner;
if (currentToken() == Token::LBrace)
{
// Special case: Code-only form.
object = make_shared<Object>();
object->name = YulString{"object"};
object->code = parseBlock();
if (!object->code)
return nullptr;
}
else
object = parseObject();
if (object && !_reuseScanner)
expectToken(Token::EOS);
return object;
}
catch (FatalError const&)
{
if (m_errorReporter.errors().empty())
throw; // Something is weird here, rather throw again.
}
return nullptr;
}
shared_ptr<Object> ObjectParser::parseObject(Object* _containingObject)
{
RecursionGuard guard(*this);
if (currentToken() != Token::Identifier || currentLiteral() != "object")
fatalParserError("Expected keyword \"object\".");
advance();
shared_ptr<Object> ret = make_shared<Object>();
ret->name = parseUniqueName(_containingObject);
expectToken(Token::LBrace);
ret->code = parseCode();
while (currentToken() != Token::RBrace)
{
if (currentToken() == Token::Identifier && currentLiteral() == "object")
parseObject(ret.get());
else if (currentToken() == Token::Identifier && currentLiteral() == "data")
parseData(*ret);
else
fatalParserError("Expected keyword \"data\" or \"object\" or \"}\".");
}
if (_containingObject)
addNamedSubObject(*_containingObject, ret->name, ret);
expectToken(Token::RBrace);
return ret;
}
shared_ptr<Block> ObjectParser::parseCode()
{
if (currentToken() != Token::Identifier || currentLiteral() != "code")
fatalParserError("Expected keyword \"code\".");
advance();
return parseBlock();
}
shared_ptr<Block> ObjectParser::parseBlock()
{
Parser parser(m_errorReporter, m_flavour);
shared_ptr<Block> block = parser.parse(m_scanner, true);
yulAssert(block || m_errorReporter.hasErrors(), "Invalid block but no error!");
return block;
}
void ObjectParser::parseData(Object& _containingObject)
{
solAssert(
currentToken() == Token::Identifier && currentLiteral() == "data",
"parseData called on wrong input."
);
advance();
YulString name = parseUniqueName(&_containingObject);
expectToken(Token::StringLiteral, false);
addNamedSubObject(_containingObject, name, make_shared<Data>(name, asBytes(currentLiteral())));
advance();
}
YulString ObjectParser::parseUniqueName(Object const* _containingObject)
{
expectToken(Token::StringLiteral, false);
YulString name{currentLiteral()};
if (name.empty())
parserError("Object name cannot be empty.");
else if (_containingObject && _containingObject->name == name)
parserError("Object name cannot be the same as the name of the containing object.");
else if (_containingObject && _containingObject->subIndexByName.count(name))
parserError("Object name \"" + name.str() + "\" already exists inside the containing object.");
advance();
return name;
}
void ObjectParser::addNamedSubObject(Object& _container, YulString _name, shared_ptr<ObjectNode> _subObject)
{
_container.subIndexByName[_name] = _container.subObjects.size();
_container.subObjects.emplace_back(std::move(_subObject));
}
|
