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Simplify inline assembly resolver.

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This commit is contained in:
chriseth 2020-06-11 18:46:31 +02:00
parent b94a00baf6
commit 5fdbb5c3e3
4 changed files with 36 additions and 44 deletions
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51
libsolidity/analysis/TypeChecker.cpp
View File

@ -666,17 +666,18 @@ bool TypeChecker::visit(InlineAssembly const& _inlineAssembly)
{
auto ref = _inlineAssembly.annotation().externalReferences.find(&_identifier);
if (ref == _inlineAssembly.annotation().externalReferences.end())
return numeric_limits<size_t>::max();
Declaration const* declaration = ref->second.declaration;
return false;
InlineAssemblyAnnotation::ExternalIdentifierInfo& identifierInfo = ref->second;
Declaration const* declaration = identifierInfo.declaration;
solAssert(!!declaration, "");
bool requiresStorage = ref->second.isSlot || ref->second.isOffset;
bool requiresStorage = identifierInfo.isSlot || identifierInfo.isOffset;
if (auto var = dynamic_cast<VariableDeclaration const*>(declaration))
{
solAssert(var->type(), "Expected variable type!");
if (var->immutable())
{
m_errorReporter.typeError(3773_error, _identifier.location, "Assembly access to immutable variables is not supported.");
return numeric_limits<size_t>::max();
return false;
}
if (var->isConstant())
{
@ -685,17 +686,17 @@ bool TypeChecker::visit(InlineAssembly const& _inlineAssembly)
if (var && !var->value())
{
m_errorReporter.typeError(3224_error, _identifier.location, "Constant has no value.");
return numeric_limits<size_t>::max();
return false;
}
else if (_context == yul::IdentifierContext::LValue)
{
m_errorReporter.typeError(6252_error, _identifier.location, "Constant variables cannot be assigned to.");
return numeric_limits<size_t>::max();
return false;
}
else if (requiresStorage)
{
m_errorReporter.typeError(6617_error, _identifier.location, "The suffixes _offset and _slot can only be used on non-constant storage variables.");
return numeric_limits<size_t>::max();
return false;
}
else if (var && var->value() && !var->value()->annotation().type && !dynamic_cast<Literal const*>(var->value().get()))
{
@ -704,7 +705,7 @@ bool TypeChecker::visit(InlineAssembly const& _inlineAssembly)
_identifier.location,
"Constant variables with non-literal values cannot be forward referenced from inline assembly."
);
return size_t(-1);
return false;
}
else if (!var || !type(*var)->isValueType() || (
!dynamic_cast<Literal const*>(var->value().get()) &&
@ -712,7 +713,7 @@ bool TypeChecker::visit(InlineAssembly const& _inlineAssembly)
))
{
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);
return false;
}
}
@ -723,33 +724,33 @@ bool TypeChecker::visit(InlineAssembly const& _inlineAssembly)
if (!var->isStateVariable() && !var->type()->dataStoredIn(DataLocation::Storage))
{
m_errorReporter.typeError(3622_error, _identifier.location, "The suffixes _offset and _slot can only be used on storage variables.");
return numeric_limits<size_t>::max();
return false;
}
else if (_context == yul::IdentifierContext::LValue)
{
if (var->isStateVariable())
{
m_errorReporter.typeError(4713_error, _identifier.location, "State variables cannot be assigned to - you have to use \"sstore()\".");
return numeric_limits<size_t>::max();
return false;
}
else if (ref->second.isOffset)
else if (identifierInfo.isOffset)
{
m_errorReporter.typeError(9739_error, _identifier.location, "Only _slot can be assigned to.");
return numeric_limits<size_t>::max();
return false;
}
else
solAssert(ref->second.isSlot, "");
solAssert(identifierInfo.isSlot, "");
}
}
else if (!var->isConstant() && var->isStateVariable())
{
m_errorReporter.typeError(1408_error, _identifier.location, "Only local variables are supported. To access storage variables, use the _slot and _offset suffixes.");
return numeric_limits<size_t>::max();
return false;
}
else if (var->type()->dataStoredIn(DataLocation::Storage))
{
m_errorReporter.typeError(9068_error, _identifier.location, "You have to use the _slot or _offset suffix to access storage reference variables.");
return numeric_limits<size_t>::max();
return false;
}
else if (var->type()->sizeOnStack() != 1)
{
@ -757,21 +758,21 @@ bool TypeChecker::visit(InlineAssembly const& _inlineAssembly)
m_errorReporter.typeError(2370_error, _identifier.location, "Call data elements cannot be accessed directly. Copy to a local variable first or use \"calldataload\" or \"calldatacopy\" with manually determined offsets and sizes.");
else
m_errorReporter.typeError(9857_error, _identifier.location, "Only types that use one stack slot are supported.");
return numeric_limits<size_t>::max();
return false;
}
}
else if (requiresStorage)
{
m_errorReporter.typeError(7944_error, _identifier.location, "The suffixes _offset and _slot can only be used on storage variables.");
return numeric_limits<size_t>::max();
return false;
}
else if (_context == yul::IdentifierContext::LValue)
{
if (dynamic_cast<MagicVariableDeclaration const*>(declaration))
return numeric_limits<size_t>::max();
return false;
m_errorReporter.typeError(1990_error, _identifier.location, "Only local variables can be assigned to in inline assembly.");
return numeric_limits<size_t>::max();
return false;
}
if (_context == yul::IdentifierContext::RValue)
@ -780,7 +781,7 @@ bool TypeChecker::visit(InlineAssembly const& _inlineAssembly)
if (dynamic_cast<FunctionDefinition const*>(declaration))
{
m_errorReporter.declarationError(2025_error, _identifier.location, "Access to functions is not allowed in inline assembly.");
return numeric_limits<size_t>::max();
return false;
}
else if (dynamic_cast<VariableDeclaration const*>(declaration))
{
@ -790,14 +791,14 @@ bool TypeChecker::visit(InlineAssembly const& _inlineAssembly)
if (!contract->isLibrary())
{
m_errorReporter.typeError(4977_error, _identifier.location, "Expected a library.");
return numeric_limits<size_t>::max();
return false;
}
}
else
return numeric_limits<size_t>::max();
return false;
}
ref->second.valueSize = 1;
return size_t(1);
identifierInfo.valueSize = 1;
return true;
};
solAssert(!_inlineAssembly.annotation().analysisInfo, "");
_inlineAssembly.annotation().analysisInfo = make_shared<yul::AsmAnalysisInfo>();

7
libsolidity/codegen/CompilerContext.cpp
View File

@ -384,12 +384,11 @@ void CompilerContext::appendInlineAssembly(
yul::Identifier const& _identifier,
yul::IdentifierContext,
bool _insideFunction
) -> size_t
) -> bool
{
if (_insideFunction)
return numeric_limits<size_t>::max();
auto it = std::find(_localVariables.begin(), _localVariables.end(), _identifier.name.str());
return it == _localVariables.end() ? numeric_limits<size_t>::max() : 1;
return false;
return contains(_localVariables, _identifier.name.str());
};
identifierAccess.generateCode = [&](
yul::Identifier const& _identifier,

20
libyul/AsmAnalysis.cpp
View File

@ -132,17 +132,11 @@ vector<YulString> AsmAnalyzer::operator()(Identifier const& _identifier)
}
else
{
bool found = false;
if (m_resolver)
{
bool insideFunction = m_currentScope->insideFunction();
size_t stackSize = m_resolver(_identifier, yul::IdentifierContext::RValue, insideFunction);
if (stackSize != numeric_limits<size_t>::max())
{
found = true;
yulAssert(stackSize == 1, "Invalid stack size of external reference.");
}
}
bool found = m_resolver && m_resolver(
_identifier,
yul::IdentifierContext::RValue,
m_currentScope->insideFunction()
);
if (!found && watcher.ok())
// Only add an error message if the callback did not do it.
m_errorReporter.declarationError(8198_error, _identifier.location, "Identifier not found.");
@ -478,12 +472,10 @@ void AsmAnalyzer::checkAssignment(Identifier const& _variable, YulString _valueT
else if (m_resolver)
{
bool insideFunction = m_currentScope->insideFunction();
size_t variableSize = m_resolver(_variable, yul::IdentifierContext::LValue, insideFunction);
if (variableSize != numeric_limits<size_t>::max())
if (m_resolver(_variable, yul::IdentifierContext::LValue, insideFunction))
{
found = true;
variableType = &m_dialect.defaultType;
yulAssert(variableSize == 1, "Invalid stack size of external reference.");
}
}

2
libyul/backends/evm/AbstractAssembly.h
View File

@ -118,7 +118,7 @@ enum class IdentifierContext { LValue, RValue, VariableDeclaration };
/// to inline assembly (not used in standalone assembly mode).
struct ExternalIdentifierAccess
{
using Resolver = std::function<size_t(Identifier const&, IdentifierContext, bool /*_crossesFunctionBoundary*/)>;
using Resolver = std::function<bool(Identifier const&, IdentifierContext, bool /*_crossesFunctionBoundary*/)>;
/// Resolve an external reference given by the identifier in the given context.
/// @returns the size of the value (number of stack slots) or size_t(-1) if not found.
Resolver resolve;