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Deprecate use of unary '+'

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The unary '+' serves no meaningful purpose in Solidity and it makes it
possible to produce typos with dagerous implications (e.g. 'a =+5 '),
so we are deprecating it.  The SyntaxChecker currently issues warnings
on the unary '+' but will still compile it for now.
This commit is contained in:
Rhett Aultman 2017-04-28 17:43:19 -07:00
parent f33614e1f7
commit e544698ad3
4 changed files with 34 additions and 1 deletions
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1
Changelog.md
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@ -10,6 +10,7 @@ Features:
* Inline Assembly: Storage variable access using ``_slot`` and ``_offset`` suffixes.
* Inline Assembly: Disallow blocks with unbalanced stack.
* Static analyzer: Warn about statements without effects.
* Syntax checker: issue deprecation warning for unary '+'
Bugfixes:
* Assembly output: Implement missing AssemblyItem types.

19
libsolidity/analysis/SyntaxChecker.cpp
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@ -32,6 +32,16 @@ bool SyntaxChecker::checkSyntax(ASTNode const& _astRoot)
return Error::containsOnlyWarnings(m_errors);
}
void SyntaxChecker::warning(SourceLocation const& _location, string const& _description)
{
auto err = make_shared<Error>(Error::Type::Warning);
*err <<
errinfo_sourceLocation(_location) <<
errinfo_comment(_description);
m_errors.push_back(err);
}
void SyntaxChecker::syntaxError(SourceLocation const& _location, std::string const& _description)
{
auto err = make_shared<Error>(Error::Type::SyntaxError);
@ -148,6 +158,15 @@ bool SyntaxChecker::visit(Break const& _breakStatement)
return true;
}
bool SyntaxChecker::visit(UnaryOperation const& _operation)
{
if (_operation.getOperator() == Token::Add)
{
warning(_operation.location(), "Use of unary + is deprecated");
}
return true;
}
bool SyntaxChecker::visit(PlaceholderStatement const&)
{
m_placeholderFound = true;

4
libsolidity/analysis/SyntaxChecker.h
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@ -32,6 +32,7 @@ namespace solidity
* The module that performs syntax analysis on the AST:
* - whether continue/break is in a for/while loop.
* - whether a modifier contains at least one '_'
* - issues deprecation warnings for unary '+'
*/
class SyntaxChecker: private ASTConstVisitor
{
@ -43,6 +44,7 @@ public:
private:
/// Adds a new error to the list of errors.
void warning(SourceLocation const& _location, std::string const& _description);
void syntaxError(SourceLocation const& _location, std::string const& _description);
virtual bool visit(SourceUnit const& _sourceUnit) override;
@ -60,6 +62,8 @@ private:
virtual bool visit(Continue const& _continueStatement) override;
virtual bool visit(Break const& _breakStatement) override;
virtual bool visit(UnaryOperation const& _operation) override;
virtual bool visit(PlaceholderStatement const& _placeholderStatement) override;
ErrorList& m_errors;

11
test/libsolidity/SolidityNameAndTypeResolution.cpp
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@ -3938,12 +3938,21 @@ BOOST_AUTO_TEST_CASE(rational_unary_operation)
char const* text = R"(
contract test {
function f() {
ufixed8x16 a = +3.25;
ufixed8x16 a = 3.25;
fixed8x16 b = -3.25;
}
}
)";
CHECK_SUCCESS(text);
text = R"(
contract test {
function f() {
ufixed8x16 a = +3.25;
fixed8x16 b = -3.25;
}
}
)";
CHECK_WARNING(text,"Use of unary + is deprecated");
}
BOOST_AUTO_TEST_CASE(leading_zero_rationals_convert)