Bugfix in virtual lookup for modifiers in libraries.

3 files changed, 16 insertions, 5 deletions

diff --git a/libsolidity/codegen/CompilerContext.cpp b/libsolidity/codegen/CompilerContext.cpp
index 0bf88267..47333046 100644
--- a/libsolidity/codegen/CompilerContext.cpp
+++ b/libsolidity/codegen/CompilerContext.cpp
@@ -193,14 +193,22 @@ Declaration const* CompilerContext::nextFunctionToCompile() const
 	return m_functionCompilationQueue.nextFunctionToCompile();
 }
 
-ModifierDefinition const& CompilerContext::functionModifier(string const& _name) const
+ModifierDefinition const& CompilerContext::resolveVirtualFunctionModifier(
+	ModifierDefinition const& _modifier
+) const
 {
+	// Libraries do not allow inheritance and their functions can be inlined, so we should not
+	// search the inheritance hierarchy (which will be the wrong one in case the function
+	// is inlined).
+	if (auto scope = dynamic_cast<ContractDefinition const*>(_modifier.scope()))
+		if (scope->isLibrary())
+			return _modifier;
 	solAssert(!m_inheritanceHierarchy.empty(), "No inheritance hierarchy set.");
 	for (ContractDefinition const* contract: m_inheritanceHierarchy)
 		for (ModifierDefinition const* modifier: contract->functionModifiers())
-			if (modifier->name() == _name)
+			if (modifier->name() == _modifier.name())
 				return *modifier;
-	solAssert(false, "Function modifier " + _name + " not found.");
+	solAssert(false, "Function modifier " + _modifier.name() + " not found in inheritance hierarchy.");
 }
 
 unsigned CompilerContext::baseStackOffsetOfVariable(Declaration const& _declaration) const
diff --git a/libsolidity/codegen/CompilerContext.h b/libsolidity/codegen/CompilerContext.h
index cf626683..7b663277 100644
--- a/libsolidity/codegen/CompilerContext.h
+++ b/libsolidity/codegen/CompilerContext.h
@@ -130,7 +130,7 @@ public:
 	void appendMissingLowLevelFunctions();
 	ABIFunctions& abiFunctions() { return m_abiFunctions; }
 
-	ModifierDefinition const& functionModifier(std::string const& _name) const;
+	ModifierDefinition const& resolveVirtualFunctionModifier(ModifierDefinition const& _modifier) const;
 	/// Returns the distance of the given local variable from the bottom of the stack (of the current function).
 	unsigned baseStackOffsetOfVariable(Declaration const& _declaration) const;
 	/// If supplied by a value returned by @ref baseStackOffsetOfVariable(variable), returns
diff --git a/libsolidity/codegen/ContractCompiler.cpp b/libsolidity/codegen/ContractCompiler.cpp
index 5a9498f0..95d6c8b5 100644
--- a/libsolidity/codegen/ContractCompiler.cpp
+++ b/libsolidity/codegen/ContractCompiler.cpp
@@ -1002,7 +1002,10 @@ void ContractCompiler::appendModifierOrFunctionCode()
 			appendModifierOrFunctionCode();
 		else
 		{
-			ModifierDefinition const& modifier = m_context.functionModifier(modifierInvocation->name()->name());
+			ModifierDefinition const& nonVirtualModifier = dynamic_cast<ModifierDefinition const&>(
+				*modifierInvocation->name()->annotation().referencedDeclaration
+			);
+			ModifierDefinition const& modifier = m_context.resolveVirtualFunctionModifier(nonVirtualModifier);
 			CompilerContext::LocationSetter locationSetter(m_context, modifier);
 			solAssert(modifier.parameters().size() == modifierInvocation->arguments().size(), "");
 			for (unsigned i = 0; i < modifier.parameters().size(); ++i)