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
183
184
185
186
187
188
189
|
/*
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/>.
*/
#pragma once
#include <libevmasm/Instruction.h>
#include <liblangutil/SourceLocation.h>
#include <libevmasm/AssemblyItem.h>
#include <libevmasm/LinkerObject.h>
#include <libevmasm/Exceptions.h>
#include <liblangutil/EVMVersion.h>
#include <libdevcore/Common.h>
#include <libdevcore/Assertions.h>
#include <libdevcore/Keccak256.h>
#include <json/json.h>
#include <iostream>
#include <sstream>
#include <memory>
namespace dev
{
namespace eth
{
using AssemblyPointer = std::shared_ptr<Assembly>;
class Assembly
{
public:
AssemblyItem newTag() { assertThrow(m_usedTags < 0xffffffff, AssemblyException, ""); return AssemblyItem(Tag, m_usedTags++); }
AssemblyItem newPushTag() { assertThrow(m_usedTags < 0xffffffff, AssemblyException, ""); return AssemblyItem(PushTag, m_usedTags++); }
/// Returns a tag identified by the given name. Creates it if it does not yet exist.
AssemblyItem namedTag(std::string const& _name);
AssemblyItem newData(bytes const& _data) { h256 h(dev::keccak256(asString(_data))); m_data[h] = _data; return AssemblyItem(PushData, h); }
bytes const& data(h256 const& _i) const { return m_data.at(_i); }
AssemblyItem newSub(AssemblyPointer const& _sub) { m_subs.push_back(_sub); return AssemblyItem(PushSub, m_subs.size() - 1); }
Assembly const& sub(size_t _sub) const { return *m_subs.at(_sub); }
Assembly& sub(size_t _sub) { return *m_subs.at(_sub); }
AssemblyItem newPushSubSize(u256 const& _subId) { return AssemblyItem(PushSubSize, _subId); }
AssemblyItem newPushLibraryAddress(std::string const& _identifier);
AssemblyItem const& append(AssemblyItem const& _i);
AssemblyItem const& append(std::string const& _data) { return append(newPushString(_data)); }
AssemblyItem const& append(bytes const& _data) { return append(newData(_data)); }
template <class T> Assembly& operator<<(T const& _d) { append(_d); return *this; }
/// Pushes the final size of the current assembly itself. Use this when the code is modified
/// after compilation and CODESIZE is not an option.
void appendProgramSize() { append(AssemblyItem(PushProgramSize)); }
void appendLibraryAddress(std::string const& _identifier) { append(newPushLibraryAddress(_identifier)); }
AssemblyItem appendJump() { auto ret = append(newPushTag()); append(solidity::Instruction::JUMP); return ret; }
AssemblyItem appendJumpI() { auto ret = append(newPushTag()); append(solidity::Instruction::JUMPI); return ret; }
AssemblyItem appendJump(AssemblyItem const& _tag) { auto ret = append(_tag.pushTag()); append(solidity::Instruction::JUMP); return ret; }
AssemblyItem appendJumpI(AssemblyItem const& _tag) { auto ret = append(_tag.pushTag()); append(solidity::Instruction::JUMPI); return ret; }
/// Adds a subroutine to the code (in the data section) and pushes its size (via a tag)
/// on the stack. @returns the pushsub assembly item.
AssemblyItem appendSubroutine(AssemblyPointer const& _assembly) { auto sub = newSub(_assembly); append(newPushSubSize(size_t(sub.data()))); return sub; }
void pushSubroutineSize(size_t _subRoutine) { append(newPushSubSize(_subRoutine)); }
/// Pushes the offset of the subroutine.
void pushSubroutineOffset(size_t _subRoutine) { append(AssemblyItem(PushSub, _subRoutine)); }
/// Appends @a _data literally to the very end of the bytecode.
void appendAuxiliaryDataToEnd(bytes const& _data) { m_auxiliaryData += _data; }
/// Returns the assembly items.
AssemblyItems const& items() const { return m_items; }
int deposit() const { return m_deposit; }
void adjustDeposit(int _adjustment) { m_deposit += _adjustment; assertThrow(m_deposit >= 0, InvalidDeposit, ""); }
void setDeposit(int _deposit) { m_deposit = _deposit; assertThrow(m_deposit >= 0, InvalidDeposit, ""); }
/// Changes the source location used for each appended item.
void setSourceLocation(langutil::SourceLocation const& _location) { m_currentSourceLocation = _location; }
/// Assembles the assembly into bytecode. The assembly should not be modified after this call, since the assembled version is cached.
LinkerObject const& assemble() const;
struct OptimiserSettings
{
bool isCreation = false;
bool runJumpdestRemover = false;
bool runPeephole = false;
bool runDeduplicate = false;
bool runCSE = false;
bool runConstantOptimiser = false;
solidity::EVMVersion evmVersion;
/// This specifies an estimate on how often each opcode in this assembly will be executed,
/// i.e. use a small value to optimise for size and a large value to optimise for runtime gas usage.
size_t expectedExecutionsPerDeployment = 200;
};
/// Execute optimisation passes as defined by @a _settings and return the optimised assembly.
Assembly& optimise(OptimiserSettings const& _settings);
/// Modify (if @a _enable is set) and return the current assembly such that creation and
/// execution gas usage is optimised. @a _isCreation should be true for the top-level assembly.
/// @a _runs specifes an estimate on how often each opcode in this assembly will be executed,
/// i.e. use a small value to optimise for size and a large value to optimise for runtime.
/// If @a _enable is not set, will perform some simple peephole optimizations.
Assembly& optimise(bool _enable, EVMVersion _evmVersion, bool _isCreation = true, size_t _runs = 200);
/// Create a text representation of the assembly.
std::string assemblyString(
StringMap const& _sourceCodes = StringMap()
) const;
void assemblyStream(
std::ostream& _out,
std::string const& _prefix = "",
StringMap const& _sourceCodes = StringMap()
) const;
/// Create a JSON representation of the assembly.
Json::Value assemblyJSON(
StringMap const& _sourceCodes = StringMap()
) const;
public:
// These features are only used by LLL
AssemblyItem newPushString(std::string const& _data) { h256 h(dev::keccak256(_data)); m_strings[h] = _data; return AssemblyItem(PushString, h); }
void append(Assembly const& _a);
void append(Assembly const& _a, int _deposit);
void injectStart(AssemblyItem const& _i);
AssemblyItem const& back() const { return m_items.back(); }
std::string backString() const { return m_items.size() && m_items.back().type() == PushString ? m_strings.at((h256)m_items.back().data()) : std::string(); }
protected:
/// Does the same operations as @a optimise, but should only be applied to a sub and
/// returns the replaced tags. Also takes an argument containing the tags of this assembly
/// that are referenced in a super-assembly.
std::map<u256, u256> optimiseInternal(OptimiserSettings const& _settings, std::set<size_t> const& _tagsReferencedFromOutside);
unsigned bytesRequired(unsigned subTagSize) const;
private:
static Json::Value createJsonValue(std::string _name, int _begin, int _end, std::string _value = std::string(), std::string _jumpType = std::string());
static std::string toStringInHex(u256 _value);
protected:
/// 0 is reserved for exception
unsigned m_usedTags = 1;
std::map<std::string, size_t> m_namedTags;
AssemblyItems m_items;
std::map<h256, bytes> m_data;
/// Data that is appended to the very end of the contract.
bytes m_auxiliaryData;
std::vector<std::shared_ptr<Assembly>> m_subs;
std::map<h256, std::string> m_strings;
std::map<h256, std::string> m_libraries; ///< Identifiers of libraries to be linked.
mutable LinkerObject m_assembledObject;
mutable std::vector<size_t> m_tagPositionsInBytecode;
int m_deposit = 0;
langutil::SourceLocation m_currentSourceLocation;
};
inline std::ostream& operator<<(std::ostream& _out, Assembly const& _a)
{
_a.assemblyStream(_out);
return _out;
}
}
}
|
