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Merge pull request #4729 from ethereum/slot-on-non-storage

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Properly handle invalid references used together with _slot and _offset.
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Alex Beregszaszi 2018-08-07 14:16:43 +01:00 committed by GitHub
commit 4158a310bd
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3 changed files with 17 additions and 1 deletions
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1
Changelog.md
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@ -83,6 +83,7 @@ Bugfixes:
* Fix NatSpec json output for `@notice` and `@dev` tags on contract definitions.
* References Resolver: Do not crash on using ``_slot`` and ``_offset`` suffixes on their own.
* References Resolver: Enforce ``storage`` as data location for mappings.
* References Resolver: Properly handle invalid references used together with ``_slot`` and ``_offset``.
* References Resolver: Report error instead of assertion fail when FunctionType has an undeclared type as parameter.
* Type Checker: Disallow assignments to mappings within tuple assignments as well.
* Type Checker: Allow assignments to local variables of mapping types.

8
libsolidity/analysis/TypeChecker.cpp
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@ -867,6 +867,7 @@ bool TypeChecker::visit(InlineAssembly const& _inlineAssembly)
return size_t(-1);
Declaration const* declaration = ref->second.declaration;
solAssert(!!declaration, "");
bool requiresStorage = ref->second.isSlot || ref->second.isOffset;
if (auto var = dynamic_cast<VariableDeclaration const*>(declaration))
{
if (var->isConstant())
@ -874,7 +875,7 @@ bool TypeChecker::visit(InlineAssembly const& _inlineAssembly)
m_errorReporter.typeError(_identifier.location, "Constant variables not supported by inline assembly.");
return size_t(-1);
}
else if (ref->second.isSlot || ref->second.isOffset)
else if (requiresStorage)
{
if (!var->isStateVariable() && !var->type()->dataStoredIn(DataLocation::Storage))
{
@ -906,6 +907,11 @@ bool TypeChecker::visit(InlineAssembly const& _inlineAssembly)
return size_t(-1);
}
}
else if (requiresStorage)
{
m_errorReporter.typeError(_identifier.location, "The suffixes _offset and _slot can only be used on storage variables.");
return size_t(-1);
}
else if (_context == julia::IdentifierContext::LValue)
{
m_errorReporter.typeError(_identifier.location, "Only local variables can be assigned to in inline assembly.");

9
test/libsolidity/syntaxTests/inlineAssembly/storage_reference_on_function.sol Normal file
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@ -0,0 +1,9 @@
contract C {
function f() pure public {
assembly {
let x := f_slot
}
}
}
// ----
// TypeError: (84-90): The suffixes _offset and _slot can only be used on storage variables.