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Output error when forward referencing constants in inline assembly

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This commit is contained in:
Mathias Baumann 2020-05-28 16:09:52 +02:00
parent 79f4a2b476
commit bdc2c63327
4 changed files with 38 additions and 8 deletions
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1
Changelog.md
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@ -22,6 +22,7 @@ Bugfixes:
* Type Checker: Fix internal compiler error when accessing members of array slices. * Type Checker: Fix internal compiler error when accessing members of array slices.
* Type Checker: Fix internal compiler error when trying to decode too large static arrays. * Type Checker: Fix internal compiler error when trying to decode too large static arrays.
* Type Checker: Fix wrong compiler error when referencing an overridden function without calling it. * Type Checker: Fix wrong compiler error when referencing an overridden function without calling it.
* Type Checker: Fix internal compiler error when forward referencing non-literal constants from inline assembly.
* NatSpec: DocString block is terminated when encountering an empty line. * NatSpec: DocString block is terminated when encountering an empty line.
* Scanner: Fix bug when two empty NatSpec comments lead to scanning past EOL. * Scanner: Fix bug when two empty NatSpec comments lead to scanning past EOL.
* Code Generator: Trigger proper unimplemented errors on certain array copy operations. * Code Generator: Trigger proper unimplemented errors on certain array copy operations.

25
libsolidity/analysis/TypeChecker.cpp
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@ -691,14 +691,6 @@ bool TypeChecker::visit(InlineAssembly const& _inlineAssembly)
m_errorReporter.typeError(3224_error, _identifier.location, "Constant has no value."); m_errorReporter.typeError(3224_error, _identifier.location, "Constant has no value.");
return size_t(-1); return size_t(-1);
} }
else if (!var || !type(*var)->isValueType() || (
dynamic_cast<Literal const*>(var->value().get()) == nullptr &&
type(*var->value())->category() != Type::Category::RationalNumber
))
{
m_errorReporter.typeError(7615_error, _identifier.location, "Only direct number constants and references to such constants are supported by inline assembly.");
return size_t(-1);
}
else if (_context == yul::IdentifierContext::LValue) else if (_context == yul::IdentifierContext::LValue)
{ {
m_errorReporter.typeError(6252_error, _identifier.location, "Constant variables cannot be assigned to."); m_errorReporter.typeError(6252_error, _identifier.location, "Constant variables cannot be assigned to.");
@ -709,6 +701,23 @@ bool TypeChecker::visit(InlineAssembly const& _inlineAssembly)
m_errorReporter.typeError(6617_error, _identifier.location, "The suffixes _offset and _slot can only be used on non-constant storage variables."); m_errorReporter.typeError(6617_error, _identifier.location, "The suffixes _offset and _slot can only be used on non-constant storage variables.");
return size_t(-1); return size_t(-1);
} }
else if (var && var->value() && !var->value()->annotation().type && !dynamic_cast<Literal const*>(var->value().get()))
{
m_errorReporter.typeError(
2249_error,
_identifier.location,
"Constant variables with non-literal values cannot be forward referenced from inline assembly."
);
return size_t(-1);
}
else if (!var || !type(*var)->isValueType() || (
!dynamic_cast<Literal const*>(var->value().get()) &&
type(*var->value())->category() != Type::Category::RationalNumber
))
{
m_errorReporter.typeError(7615_error, _identifier.location, "Only direct number constants and references to such constants are supported by inline assembly.");
return size_t(-1);
}
} }
if (requiresStorage) if (requiresStorage)

8
test/libsolidity/syntaxTests/inlineAssembly/const_forward_reference.sol Normal file
View File

@ -0,0 +1,8 @@
contract C {
function f() public pure {
assembly {
pop(add(add(1, 2), c))
}
}
int constant c = 1;
}

12
test/libsolidity/syntaxTests/inlineAssembly/invalid/const_forward_reference.sol Normal file
View File

@ -0,0 +1,12 @@
contract C {
function f() {
assembly {
c := add(add(1, 2), c)
}
}
int constant c = 0 + 1;
}
// ----
// SyntaxError: (15-83): No visibility specified. Did you intend to add "public"?
// TypeError: (71-72): Constant variables with non-literal values cannot be forward referenced from inline assembly.
// TypeError: (51-52): Constant variables cannot be assigned to.