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Merge pull request #5630 from ethereum/warn_functions_empty_body

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Supress unused var and state mut warnings for functions with empty body
This commit is contained in:
chriseth 2018-12-12 17:00:50 +01:00 committed by GitHub
commit 87237281bf
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GPG Key ID: 4AEE18F83AFDEB23
38 changed files with 16 additions and 89 deletions
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1
Changelog.md
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@ -9,6 +9,7 @@ Compiler Features:
* Code Generator: Use codecopy for string constants more aggressively.
* Code Generator: Use binary search for dispatch function if more efficient. The size/speed tradeoff can be tuned using ``--optimize-runs``.
* SMTChecker: Support mathematical and cryptographic functions in an uninterpreted way.
* Static Analyzer: Do not warn about unused variables or state mutability for functions with an empty body.
* Type Checker: Add an additional reason to be displayed when type conversion fails.
* Yul: Support object access via ``datasize``, ``dataoffset`` and ``datacopy`` in standalone assembly mode.

28
libsolidity/analysis/StaticAnalyzer.cpp
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@ -63,21 +63,21 @@ bool StaticAnalyzer::visit(FunctionDefinition const& _function)
void StaticAnalyzer::endVisit(FunctionDefinition const&)
{
m_currentFunction = nullptr;
m_constructor = false;
for (auto const& var: m_localVarUseCount)
if (var.second == 0)
{
if (var.first.second->isCallableParameter())
m_errorReporter.warning(
var.first.second->location(),
"Unused function parameter. Remove or comment out the variable name to silence this warning."
);
else
m_errorReporter.warning(var.first.second->location(), "Unused local variable.");
}
if (m_currentFunction && !m_currentFunction->body().statements().empty())
for (auto const& var: m_localVarUseCount)
if (var.second == 0)
{
if (var.first.second->isCallableParameter())
m_errorReporter.warning(
var.first.second->location(),
"Unused function parameter. Remove or comment out the variable name to silence this warning."
);
else
m_errorReporter.warning(var.first.second->location(), "Unused local variable.");
}
m_localVarUseCount.clear();
m_constructor = false;
m_currentFunction = nullptr;
}
bool StaticAnalyzer::visit(Identifier const& _identifier)

1
libsolidity/analysis/ViewPureChecker.cpp
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@ -156,6 +156,7 @@ void ViewPureChecker::endVisit(FunctionDefinition const& _funDef)
m_bestMutabilityAndLocation.mutability < _funDef.stateMutability() &&
_funDef.stateMutability() != StateMutability::Payable &&
_funDef.isImplemented() &&
!_funDef.body().statements().empty() &&
!_funDef.isConstructor() &&
!_funDef.isFallback() &&
!_funDef.annotation().superFunction

6
test/libsolidity/syntaxTests/functionTypes/valid_function_type_variables.sol
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@ -18,9 +18,3 @@ contract test {
function(uint) pure internal h = fh;
}
// ----
// Warning: (20-47): Function state mutability can be restricted to pure
// Warning: (52-81): Function state mutability can be restricted to pure
// Warning: (86-115): Function state mutability can be restricted to pure
// Warning: (120-149): Function state mutability can be restricted to pure
// Warning: (154-183): Function state mutability can be restricted to pure
// Warning: (188-217): Function state mutability can be restricted to pure

1
test/libsolidity/syntaxTests/nameAndTypeResolution/004_reference_to_later_declaration.sol
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@ -3,4 +3,3 @@ contract test {
function f() public {}
}
// ----
// Warning: (53-75): Function state mutability can be restricted to pure

1
test/libsolidity/syntaxTests/nameAndTypeResolution/009_type_checking_function_call.sol
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@ -3,4 +3,3 @@ contract test {
function g(uint256, bool) public returns (uint256) { }
}
// ----
// Warning: (88-142): Function state mutability can be restricted to pure

2
test/libsolidity/syntaxTests/nameAndTypeResolution/049_function_external_call_allowed_conversion.sol
View File

@ -7,5 +7,3 @@ contract Test {
function g (C c) external {}
}
// ----
// Warning: (125-128): Unused function parameter. Remove or comment out the variable name to silence this warning.
// Warning: (113-141): Function state mutability can be restricted to pure

2
test/libsolidity/syntaxTests/nameAndTypeResolution/051_function_internal_allowed_conversion.sol
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@ -9,5 +9,3 @@ contract Test {
}
}
// ----
// Warning: (68-71): Unused function parameter. Remove or comment out the variable name to silence this warning.
// Warning: (56-82): Function state mutability can be restricted to pure

2
test/libsolidity/syntaxTests/nameAndTypeResolution/055_inheritance_diamond_basic.sol
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@ -5,5 +5,3 @@ contract derived is root, inter2, inter1 {
function g() public { f(); rootFunction(); }
}
// ----
// Warning: (16-49): Function state mutability can be restricted to pure
// Warning: (129-151): Function state mutability can be restricted to pure

3
test/libsolidity/syntaxTests/nameAndTypeResolution/057_legal_override_direct.sol
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@ -1,6 +1,3 @@
contract B { function f() public {} }
contract C is B { function f(uint i) public {} }
// ----
// Warning: (67-73): Unused function parameter. Remove or comment out the variable name to silence this warning.
// Warning: (13-35): Function state mutability can be restricted to pure
// Warning: (56-84): Function state mutability can be restricted to pure

3
test/libsolidity/syntaxTests/nameAndTypeResolution/058_legal_override_indirect.sol
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@ -2,6 +2,3 @@ contract A { function f(uint a) public {} }
contract B { function f() public {} }
contract C is A, B { }
// ----
// Warning: (24-30): Unused function parameter. Remove or comment out the variable name to silence this warning.
// Warning: (13-41): Function state mutability can be restricted to pure
// Warning: (57-79): Function state mutability can be restricted to pure

1
test/libsolidity/syntaxTests/nameAndTypeResolution/060_complex_inheritance.sol
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@ -3,4 +3,3 @@ contract B { function f() public {} function g() public returns (uint8) {} }
contract C is A, B { }
// ----
// Warning: (35-42): Unused local variable.
// Warning: (95-133): Function state mutability can be restricted to pure

1
test/libsolidity/syntaxTests/nameAndTypeResolution/061_missing_base_constructor_arguments.sol
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@ -1,4 +1,3 @@
contract A { constructor(uint a) public { } }
contract B is A { }
// ----
// Warning: (25-31): Unused function parameter. Remove or comment out the variable name to silence this warning.

1
test/libsolidity/syntaxTests/nameAndTypeResolution/062_base_constructor_arguments_override.sol
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@ -1,4 +1,3 @@
contract A { constructor(uint a) public { } }
contract B is A { }
// ----
// Warning: (25-31): Unused function parameter. Remove or comment out the variable name to silence this warning.

1
test/libsolidity/syntaxTests/nameAndTypeResolution/096_access_to_default_function_visibility.sol
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@ -5,4 +5,3 @@ contract d {
function g() public { c(0).f(); }
}
// ----
// Warning: (17-39): Function state mutability can be restricted to pure

1
test/libsolidity/syntaxTests/nameAndTypeResolution/104_empty_name_input_parameter.sol
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@ -2,4 +2,3 @@ contract test {
function f(uint) public { }
}
// ----
// Warning: (20-47): Function state mutability can be restricted to pure

1
test/libsolidity/syntaxTests/nameAndTypeResolution/106_empty_name_return_parameter.sol
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@ -2,4 +2,3 @@ contract test {
function f() public returns (bool) { }
}
// ----
// Warning: (20-58): Function state mutability can be restricted to pure

2
test/libsolidity/syntaxTests/nameAndTypeResolution/216_function_argument_storage_to_mem.sol
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@ -6,5 +6,3 @@ contract C {
}
}
// ----
// Warning: (91-106): Unused function parameter. Remove or comment out the variable name to silence this warning.
// Warning: (80-122): Function state mutability can be restricted to pure

1
test/libsolidity/syntaxTests/nameAndTypeResolution/256_using_for_overload.sol
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@ -11,4 +11,3 @@ contract C {
}
}
// ----
// Warning: (128-189): Function state mutability can be restricted to pure

1
test/libsolidity/syntaxTests/nameAndTypeResolution/260_library_memory_struct.sol
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@ -5,4 +5,3 @@ library c {
}
// ----
// Warning: (0-33): Experimental features are turned on. Do not use experimental features on live deployments.
// Warning: (75-116): Function state mutability can be restricted to pure

2
test/libsolidity/syntaxTests/nameAndTypeResolution/288_conditional_with_all_types.sol
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@ -85,7 +85,5 @@ contract C {
}
// ----
// Warning: (1005-1019): This declaration shadows an existing declaration.
// Warning: (90-116): Function state mutability can be restricted to pure
// Warning: (121-147): Function state mutability can be restricted to pure
// Warning: (257-642): Function state mutability can be restricted to pure
// Warning: (647-1227): Function state mutability can be restricted to pure

1
test/libsolidity/syntaxTests/nameAndTypeResolution/345_unused_return_value.sol
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@ -5,4 +5,3 @@ contract test {
}
}
// ----
// Warning: (20-57): Function state mutability can be restricted to pure

1
test/libsolidity/syntaxTests/nameAndTypeResolution/376_inline_assembly_in_modifier.sol
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@ -10,4 +10,3 @@ contract test {
}
}
// ----
// Warning: (122-151): Function state mutability can be restricted to pure

1
test/libsolidity/syntaxTests/nameAndTypeResolution/403_return_structs.sol
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@ -7,4 +7,3 @@ contract C {
}
// ----
// Warning: (0-33): Experimental features are turned on. Do not use experimental features on live deployments.
// Warning: (112-164): Function state mutability can be restricted to pure

1
test/libsolidity/syntaxTests/nameAndTypeResolution/437_warn_unused_function_parameter.sol
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@ -3,4 +3,3 @@ contract C {
}
}
// ----
// Warning: (28-34): Unused function parameter. Remove or comment out the variable name to silence this warning.

1
test/libsolidity/syntaxTests/nameAndTypeResolution/439_warn_unused_return_parameter.sol
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@ -3,4 +3,3 @@ contract C {
}
}
// ----
// Warning: (51-57): Unused function parameter. Remove or comment out the variable name to silence this warning.

4
test/libsolidity/syntaxTests/parsing/empty_function.sol
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@ -3,7 +3,3 @@ contract test {
function functionName(bytes20 arg1, address addr) public view returns (int id) { }
}
// ----
// Warning: (58-70): Unused function parameter. Remove or comment out the variable name to silence this warning.
// Warning: (72-84): Unused function parameter. Remove or comment out the variable name to silence this warning.
// Warning: (107-113): Unused function parameter. Remove or comment out the variable name to silence this warning.
// Warning: (36-118): Function state mutability can be restricted to pure

1
test/libsolidity/syntaxTests/parsing/external_function.sol
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@ -2,4 +2,3 @@ contract c {
function x() external {}
}
// ----
// Warning: (17-41): Function state mutability can be restricted to pure

3
test/libsolidity/syntaxTests/parsing/function_normal_comments.sol
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@ -4,6 +4,3 @@ contract test {
function functionName(bytes32 input) public returns (bytes32 out) {}
}
// ----
// Warning: (97-110): Unused function parameter. Remove or comment out the variable name to silence this warning.
// Warning: (128-139): Unused function parameter. Remove or comment out the variable name to silence this warning.
// Warning: (75-143): Function state mutability can be restricted to pure

4
test/libsolidity/syntaxTests/parsing/function_type_as_storage_variable_with_assignment.sol
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@ -3,7 +3,3 @@ contract test {
function (uint, uint) internal returns (uint) f1 = f;
}
// ----
// Warning: (31-37): Unused function parameter. Remove or comment out the variable name to silence this warning.
// Warning: (39-45): Unused function parameter. Remove or comment out the variable name to silence this warning.
// Warning: (63-69): Unused function parameter. Remove or comment out the variable name to silence this warning.
// Warning: (20-73): Function state mutability can be restricted to pure

4
test/libsolidity/syntaxTests/parsing/function_type_in_expression.sol
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@ -5,9 +5,5 @@ contract test {
}
}
// ----
// Warning: (31-37): Unused function parameter. Remove or comment out the variable name to silence this warning.
// Warning: (39-45): Unused function parameter. Remove or comment out the variable name to silence this warning.
// Warning: (63-69): Unused function parameter. Remove or comment out the variable name to silence this warning.
// Warning: (108-156): Unused local variable.
// Warning: (20-73): Function state mutability can be restricted to pure
// Warning: (78-167): Function state mutability can be restricted to pure

1
test/libsolidity/syntaxTests/parsing/library_simple.sol
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@ -2,4 +2,3 @@ library Lib {
function f() public { }
}
// ----
// Warning: (18-41): Function state mutability can be restricted to pure

1
test/libsolidity/syntaxTests/parsing/modifier_invocation.sol
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@ -4,4 +4,3 @@ contract c {
function f() public mod1(7) mod2 { }
}
// ----
// Warning: (135-171): Function state mutability can be restricted to view

12
test/libsolidity/syntaxTests/parsing/multiple_functions_natspec_documentation.sol
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@ -10,15 +10,3 @@ contract test {
function functionName4(bytes32 input) public returns (bytes32 out) {}
}
// ----
// Warning: (97-110): Unused function parameter. Remove or comment out the variable name to silence this warning.
// Warning: (128-139): Unused function parameter. Remove or comment out the variable name to silence this warning.
// Warning: (203-216): Unused function parameter. Remove or comment out the variable name to silence this warning.
// Warning: (234-245): Unused function parameter. Remove or comment out the variable name to silence this warning.
// Warning: (304-317): Unused function parameter. Remove or comment out the variable name to silence this warning.
// Warning: (335-346): Unused function parameter. Remove or comment out the variable name to silence this warning.
// Warning: (410-423): Unused function parameter. Remove or comment out the variable name to silence this warning.
// Warning: (441-452): Unused function parameter. Remove or comment out the variable name to silence this warning.
// Warning: (74-143): Function state mutability can be restricted to pure
// Warning: (180-249): Function state mutability can be restricted to pure
// Warning: (281-350): Function state mutability can be restricted to pure
// Warning: (387-456): Function state mutability can be restricted to pure

1
test/libsolidity/syntaxTests/parsing/no_function_params.sol
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@ -3,4 +3,3 @@ contract test {
function functionName() public {}
}
// ----
// Warning: (36-69): Function state mutability can be restricted to pure

3
test/libsolidity/syntaxTests/parsing/single_function_param.sol
View File

@ -3,6 +3,3 @@ contract test {
function functionName(bytes32 input) public returns (bytes32 out) {}
}
// ----
// Warning: (58-71): Unused function parameter. Remove or comment out the variable name to silence this warning.
// Warning: (89-100): Unused function parameter. Remove or comment out the variable name to silence this warning.
// Warning: (36-104): Function state mutability can be restricted to pure

3
test/libsolidity/syntaxTests/parsing/visibility_specifiers.sol
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@ -9,6 +9,3 @@ contract c {
}
// ----
// Warning: (58-71): This declaration shadows an existing declaration.
// Warning: (89-111): Function state mutability can be restricted to pure
// Warning: (116-144): Function state mutability can be restricted to pure
// Warning: (149-182): Function state mutability can be restricted to pure

1
test/libsolidity/syntaxTests/viewPureChecker/suggest_pure.sol
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@ -2,4 +2,3 @@ contract C {
function g() view public { }
}
// ----
// Warning: (17-45): Function state mutability can be restricted to pure