From 7a24a5764edf728f0caa14e7aa8f832d7e6f42e3 Mon Sep 17 00:00:00 2001
From: chriseth <c@ethdev.com>
Date: Fri, 24 Feb 2017 19:31:20 +0100
Subject: Add line info to serious exceptions.

---
 libdevcore/Exceptions.h              |  3 +++
 libsolidity/interface/Exceptions.cpp | 14 ++++++++++++++
 solc/jsonCompiler.cpp                |  6 +++---
 3 files changed, 20 insertions(+), 3 deletions(-)

diff --git a/libdevcore/Exceptions.h b/libdevcore/Exceptions.h
index 4622774a..37cdbed9 100644
--- a/libdevcore/Exceptions.h
+++ b/libdevcore/Exceptions.h
@@ -41,6 +41,9 @@ struct Exception: virtual std::exception, virtual boost::exception
 	Exception(std::string _message = std::string()): m_message(std::move(_message)) {}
 	const char* what() const noexcept override { return m_message.empty() ? std::exception::what() : m_message.c_str(); }
 
+	/// @returns "FileName:LineNumber" referring to the point where the exception was thrown.
+	std::string lineInfo() const;
+
 private:
 	std::string m_message;
 };
diff --git a/libsolidity/interface/Exceptions.cpp b/libsolidity/interface/Exceptions.cpp
index 90a680b4..41890b91 100644
--- a/libsolidity/interface/Exceptions.cpp
+++ b/libsolidity/interface/Exceptions.cpp
@@ -23,6 +23,7 @@
 #include <libsolidity/interface/Exceptions.h>
 #include <libsolidity/interface/Utils.h>
 
+using namespace std;
 using namespace dev;
 using namespace dev::solidity;
 
@@ -56,3 +57,16 @@ Error::Error(Type _type): m_type(_type)
 		break;
 	}
 }
+
+string Exception::lineInfo() const
+{
+	char const* const* file = boost::get_error_info<boost::throw_file>(*this);
+	int const* line = boost::get_error_info<boost::throw_line>(*this);
+	string ret;
+	if (file)
+		ret += *file;
+	ret += ':';
+	if (line)
+		ret += boost::lexical_cast<string>(*line);
+	return ret;
+}
diff --git a/solc/jsonCompiler.cpp b/solc/jsonCompiler.cpp
index d761b541..6ebd1a55 100644
--- a/solc/jsonCompiler.cpp
+++ b/solc/jsonCompiler.cpp
@@ -184,15 +184,15 @@ string compile(StringMap const& _sources, bool _optimize, CStyleReadFileCallback
 	}
 	catch (CompilerError const& exception)
 	{
-		errors.append(formatError(exception, "Compiler error", scannerFromSourceName));
+		errors.append(formatError(exception, "Compiler error (" + exception.lineInfo() + ")", scannerFromSourceName));
 	}
 	catch (InternalCompilerError const& exception)
 	{
-		errors.append(formatError(exception, "Internal compiler error", scannerFromSourceName));
+		errors.append(formatError(exception, "Internal compiler error (" + exception.lineInfo() + ")", scannerFromSourceName));
 	}
 	catch (UnimplementedFeatureError const& exception)
 	{
-		errors.append(formatError(exception, "Unimplemented feature", scannerFromSourceName));
+		errors.append(formatError(exception, "Unimplemented feature (" + exception.lineInfo() + ")", scannerFromSourceName));
 	}
 	catch (Exception const& exception)
 	{
-- 
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