From 998ca552b8966d67bbbc7482e972563efade9a80 Mon Sep 17 00:00:00 2001
From: Alex Beregszaszi <alex@rtfs.hu>
Date: Thu, 1 Jun 2017 13:28:32 +0100
Subject: Fix state after CompilerStack.reset()

---
 libsolidity/interface/CompilerStack.cpp | 20 +++++++++++++++++++-
 libsolidity/interface/CompilerStack.h   |  7 +++++++
 2 files changed, 26 insertions(+), 1 deletion(-)

(limited to 'libsolidity/interface')

diff --git a/libsolidity/interface/CompilerStack.cpp b/libsolidity/interface/CompilerStack.cpp
index c3fcc1ef..aca9ce39 100644
--- a/libsolidity/interface/CompilerStack.cpp
+++ b/libsolidity/interface/CompilerStack.cpp
@@ -85,6 +85,7 @@ void CompilerStack::reset(bool _keepSources)
 	}
 	else
 	{
+		m_stackState = Empty;
 		m_sources.clear();
 	}
 	m_optimize = false;
@@ -94,7 +95,6 @@ void CompilerStack::reset(bool _keepSources)
 	m_sourceOrder.clear();
 	m_contracts.clear();
 	m_errorReporter.clear();
-	m_stackState = Empty;
 }
 
 bool CompilerStack::addSource(string const& _name, string const& _content, bool _isLibrary)
@@ -513,6 +513,24 @@ ContractDefinition const& CompilerStack::contractDefinition(string const& _contr
 	return *contract(_contractName).contract;
 }
 
+size_t CompilerStack::functionEntryPoint(
+	std::string const& _contractName,
+	FunctionDefinition const& _function
+) const
+{
+	shared_ptr<Compiler> const& compiler = contract(_contractName).compiler;
+	if (!compiler)
+		return 0;
+	eth::AssemblyItem tag = compiler->functionEntryLabel(_function);
+	if (tag.type() == eth::UndefinedItem)
+		return 0;
+	eth::AssemblyItems const& items = compiler->runtimeAssemblyItems();
+	for (size_t i = 0; i < items.size(); ++i)
+		if (items.at(i).type() == eth::Tag && items.at(i).data() == tag.data())
+			return i;
+	return 0;
+}
+
 tuple<int, int, int, int> CompilerStack::positionFromSourceLocation(SourceLocation const& _sourceLocation) const
 {
 	int startLine;
diff --git a/libsolidity/interface/CompilerStack.h b/libsolidity/interface/CompilerStack.h
index d97b3960..bffdeabd 100644
--- a/libsolidity/interface/CompilerStack.h
+++ b/libsolidity/interface/CompilerStack.h
@@ -259,6 +259,13 @@ private:
 	Json::Value const& contractABI(Contract const&) const;
 	Json::Value const& natspec(Contract const&, DocumentationType _type) const;
 
+	/// @returns the offset of the entry point of the given function into the list of assembly items
+	/// or zero if it is not found or does not exist.
+	size_t functionEntryPoint(
+		std::string const& _contractName,
+		FunctionDefinition const& _function
+	) const;
+
 	struct Remapping
 	{
 		std::string context;
-- 
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