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Feist Josselin edited this page Feb 14, 2019 · 36 revisions

Slither allows printing contracts information through its printers.

Num Printer Description
1 call-graph Export the call-graph of the contracts to a dot file
2 cfg Export the CFG of each functions
3 contract-summary Print a summary of the contracts
4 data-dependency Print the data dependencies of the variables
5 function-id Print the keccack256 signature of the functions
6 function-summary Print a summary of the functions
7 human-summary Print a human-readable summary of the contracts
8 inheritance Print the inheritance relations between contracts
9 inheritance-graph Export the inheritance graph of each contract to a dot file
10 modifiers Print the modifiers called by each function
11 require Print the require and assert calls of each function
12 slithir Print the slithIR representation of the functions
13 slithir-ssa Print the slithIR representation of the functions
14 variables-order Print the storage order of the state variables
15 vars-and-auth Print the state variables written and the authorization of the functions

Several printers require xdot installed for visualization:

sudo apt install xdot

Call Graph

slither file.sol --print call-graph

Export the call-graph of the contracts to a dot file

Example

$ slither examples/printers/call_graph.sol --print contract-summary

The output format is dot. To vizualize the graph:

$ xdot examples/printers/call_graph.sol.dot

To convert the file to svg:

$ dot examples/printers/call_graph.sol.dot -Tsvg -o examples/printers/call_graph.sol.png

CFG

Export the control flow graph of each function

slither file.sol --print cfg

Example

The output format is dot. To vizualize the graph:

$ xdot function.sol.dot

To convert the file to svg:

$ dot function.dot -Tsvg -o function.sol.png

Contract Summary

Output a quick summary of the contract.

slither file.sol --print contract-summary

Example

$ slither examples/printers/quick_summary.sol --print contract-summary

Data Dependencies

Print the data dependencies of the variables slither file.sol --print data-dependency

Example

$ slither examples/printers/data_dependencies.sol --print data-dependency

Contract MyContract
+----------+----------------------+
| Variable |     Dependencies     |
+----------+----------------------+
|    a     |     ['input_a']      |
|    b     | ['input_b', 'input'] |
|    c     |          []          |
+----------+----------------------+

Function setA(uint256,uint256)
+--------------+--------------+
|   Variable   | Dependencies |
+--------------+--------------+
|   input_a    |      []      |
|   input_b    |      []      |
| MyContract:a | ['input_a']  |
| MyContract:b |      []      |
| MyContract:c |      []      |
+--------------+--------------+
Function setB(uint256)
+--------------+----------------------+
|   Variable   |     Dependencies     |
+--------------+----------------------+
|    input     |     ['input_b']      |
| MyContract:a |          []          |
| MyContract:b | ['input_b', 'input'] |
| MyContract:c |          []          |
+--------------+----------------------+

Function id

slither file.sol --print function-id Print the keccack256 signature of the functions

Examples

$ slither examples/printers/authorization.sol --print function-id
INFO:Printers:
MyContract:
+---------------+------------+
|      Name     |     ID     |
+---------------+------------+
| constructor() | 0x90fa17bb |
| mint(uint256) | 0xa0712d68 |
+---------------+------------+

Function Summary

slither file.sol --print function-summary

Output a summary of the contract showing for each function:

  • What are the visibility and the modifiers
  • What are the state variables read or written
  • What are the calls

Example

$ slither tests/backdoor.sol --print function-summary

[...]

Contract C
Contract vars: []
Inheritances:: []
 
+-----------------+------------+-----------+----------------+-------+---------------------------+----------------+
|     Function    | Visibility | Modifiers |      Read      | Write |       Internal Calls      | External Calls |
+-----------------+------------+-----------+----------------+-------+---------------------------+----------------+
| i_am_a_backdoor |   public   |     []    | ['msg.sender'] |   []  | ['selfdestruct(address)'] |       []       |
+-----------------+------------+-----------+----------------+-------+---------------------------+----------------+

+-----------+------------+------+-------+----------------+----------------+
| Modifiers | Visibility | Read | Write | Internal Calls | External Calls |
+-----------+------------+------+-------+----------------+----------------+
+-----------+------------+------+-------+----------------+----------------+

Human Summary

slither file.sol --print contract-summary

Print a human-readable summary of the contracts

Example

$ slither examples/printers/human_printer.sol --print human-summary

Inheritance

slither file.sol --print inheritance Print the inheritance relations between contracts

Example

$ slither examples/printers/inheritances.sol --print inheritance

Inheritance Graph

slither file.sol --print inheritance-graph

Output a graph showing the inheritance interaction between the contracts.

Example

$ slither examples/printers/inheritances.sol --print inheritance-graph
[...]
INFO:PrinterInheritance:Inheritance Graph: examples/DAO.sol.dot

The output format is dot. To vizualize the graph:

$ xdot examples/printers/inheritances.sol.dot

To convert the file to svg:

$ dot examples/printers/inheritances.sol.dot -Tsvg -o examples/printers/inheritances.sol.png

Indicators:

  • If a contract has multiple inheritance, the connecting edges will be labelled in order of declaration.
  • Functions highlighted orange override a parent's function.
  • Functions which do not override each other directly (but collide due to multiple inheritance) will be emphasized at the bottom of the affected contract node in grey font.
  • Variables highlighted red overshadow a parent's variable declaration.
  • Variables of type contract specify the contract name in parentheses in a blue font.

Modifiers

slither file.sol --print modifiers

Print the modifiers called by each function.

Example

$ slither examples/printers/modifier.sol --print modifiers
INFO:Printers:
Contract C
+-------------+-------------+
|   Function  |  Modifiers  |
+-------------+-------------+
| constructor |      []     |
|     set     | ['isOwner'] |
+-------------+-------------+

Require

slither file.sol --print require

Print the require and assert calls of each function.

Example

$ slither examples/printers/require.sol --print require
INFO:Printers:
Contract Lib
+----------+--------------------------------------+
| Function |          require or assert           |
+----------+--------------------------------------+
|   set    | require(bool)(msg.sender == s.owner) |
+----------+--------------------------------------+
INFO:Printers:
Contract C
+-------------+--------------------------------------+
|   Function  |          require or assert           |
+-------------+--------------------------------------+
| constructor |                                      |
|     set     | require(bool)(msg.sender == s.owner) |
+-------------+--------------------------------------+

SlithIR

slither file.sol --print slithir

Print the slithIR representation of the functions

Example

$ slither examples/printers/slihtir.sol --print slithir
Contract UnsafeMath
	Function add(uint256,uint256)
		Expression: a + b
		IRs:
			TMP_0(uint256) = a + b
			RETURN TMP_0
	Function min(uint256,uint256)
		Expression: a - b
		IRs:
			TMP_0(uint256) = a - b
			RETURN TMP_0
Contract MyContract
	Function transfer(address,uint256)
		Expression: balances[msg.sender] = balances[msg.sender].min(val)
		IRs:
			REF_3(uint256) -> balances[msg.sender]
			REF_1(uint256) -> balances[msg.sender]
			TMP_1(uint256) = LIBRARY_CALL, dest:UnsafeMath, function:min, arguments:['REF_1', 'val'] 
			REF_3 := TMP_1
		Expression: balances[to] = balances[to].add(val)
		IRs:
			REF_3(uint256) -> balances[to]
			REF_1(uint256) -> balances[to]
			TMP_1(uint256) = LIBRARY_CALL, dest:UnsafeMath, function:add, arguments:['REF_1', 'val'] 
			REF_3 := TMP_1

SlithIR-SSA

slither file.sol --print slithir-ssa

Print the slithIR representation of the functions (SSA version)

Variables order

slither file.sol --print variables-order

Print the storage order of the state variables

Example

$ slither tests/check-upgradability/contractV2_bug.sol --print variables-order
INFO:Printers:
ContractV2:
+-------------+---------+
|     Name    |   Type  |
+-------------+---------+
| destination | uint256 |
|    myFunc   | uint256 |
+-------------+---------+

Variables written and authorization

slither file.sol --print vars-and-auth

Print the variables written and the check on msg.sender of each function.

Example

...
$ slither examples/printers/authorization.sol --print vars-and-auth
[..]
INFO:Printers:
Contract MyContract
+-------------+-------------------------+----------------------------------------+
|   Function  | State variables written |        Conditions on msg.sender        |
+-------------+-------------------------+----------------------------------------+
| constructor |        ['owner']        |                   []                   |
|     mint    |       ['balances']      | ['require(bool)(msg.sender == owner)'] |
+-------------+-------------------------+----------------------------------------+
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