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
|
/*
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 <libsolidity/formal/SolverInterface.h>
#include <libsolidity/ast/ASTVisitor.h>
#include <libsolidity/interface/ReadFile.h>
#include <map>
#include <string>
namespace dev
{
namespace solidity
{
class VariableUsage;
class ErrorReporter;
class SMTChecker: private ASTConstVisitor
{
public:
SMTChecker(ErrorReporter& _errorReporter, ReadCallback::Callback const& _readCallback);
void analyze(SourceUnit const& _sources);
private:
// TODO: Check that we do not have concurrent reads and writes to a variable,
// because the order of expression evaluation is undefined
// TODO: or just force a certain order, but people might have a different idea about that.
virtual void endVisit(VariableDeclaration const& _node) override;
virtual bool visit(FunctionDefinition const& _node) override;
virtual void endVisit(FunctionDefinition const& _node) override;
virtual bool visit(IfStatement const& _node) override;
virtual bool visit(WhileStatement const& _node) override;
virtual void endVisit(VariableDeclarationStatement const& _node) override;
virtual void endVisit(ExpressionStatement const& _node) override;
virtual void endVisit(Assignment const& _node) override;
virtual void endVisit(TupleExpression const& _node) override;
virtual void endVisit(BinaryOperation const& _node) override;
virtual void endVisit(FunctionCall const& _node) override;
virtual void endVisit(Identifier const& _node) override;
virtual void endVisit(Literal const& _node) override;
void arithmeticOperation(BinaryOperation const& _op);
void compareOperation(BinaryOperation const& _op);
void booleanOperation(BinaryOperation const& _op);
void assignment(Declaration const& _variable, Expression const& _value);
// Visits the branch given by the statement, pushes and pops the SMT checker.
// @param _condition if present, asserts that this condition is true within the branch.
void visitBranch(Statement const& _statement, smt::Expression const* _condition = nullptr);
void visitBranch(Statement const& _statement, smt::Expression _condition);
void checkCondition(
smt::Expression _condition,
SourceLocation const& _location,
std::string const& _description,
std::string const& _additionalValueName = "",
smt::Expression* _additionalValue = nullptr
);
void initializeLocalVariables(FunctionDefinition const& _function);
void resetVariables(std::vector<Declaration const*> _variables);
void createVariable(VariableDeclaration const& _varDecl);
static std::string uniqueSymbol(Declaration const& _decl);
static std::string uniqueSymbol(Expression const& _expr);
/// @returns true if _delc is a variable that is known at the current point, i.e.
/// has a valid sequence number
bool knownVariable(Declaration const& _decl);
/// @returns an expression denoting the value of the variable declared in @a _decl
/// at the current point.
smt::Expression currentValue(Declaration const& _decl);
/// @returns an expression denoting the value of the variable declared in @a _decl
/// at the given sequence point. Does not ensure that this sequence point exists.
smt::Expression valueAtSequence(Declaration const& _decl, int _sequence);
/// Allocates a new sequence number for the declaration, updates the current
/// sequence number to this value and returns the expression.
smt::Expression newValue(Declaration const& _decl);
/// Sets the value of the declaration to zero.
void setZeroValue(Declaration const& _decl);
/// Resets the variable to an unknown value (in its range).
void setUnknownValue(Declaration const& decl);
static smt::Expression minValue(IntegerType const& _t);
static smt::Expression maxValue(IntegerType const& _t);
using VariableSequenceCounters = std::map<Declaration const*, int>;
/// Returns the expression corresponding to the AST node. Creates a new expression
/// if it does not exist yet.
smt::Expression expr(Expression const& _e);
/// Returns the function declaration corresponding to the given variable.
/// The function takes one argument which is the "sequence number".
smt::Expression var(Declaration const& _decl);
std::shared_ptr<smt::SolverInterface> m_interface;
std::shared_ptr<VariableUsage> m_variableUsage;
bool m_conditionalExecutionHappened = false;
std::map<Declaration const*, int> m_currentSequenceCounter;
std::map<Declaration const*, int> m_nextFreeSequenceCounter;
std::map<Expression const*, smt::Expression> m_expressions;
std::map<Declaration const*, smt::Expression> m_variables;
ErrorReporter& m_errorReporter;
FunctionDefinition const* m_currentFunction = nullptr;
};
}
}
|
