fix issue##5007

Changelog.md

@@ -132,6 +132,7 @@ Bugfixes:
  * Type Checker: Fix internal error when array index is not an unsigned.
  * Type System: Allow arbitrary exponents for literals with a mantissa of zero.
  * Parser: Fix incorrect source location for nameless parameters.
+ * Command Line Interface: Fix internal error when compiling stdin with no content and --ast option.
 
 ### 0.4.25 (2018-09-12)
 

solc/CommandLineInterface.cpp

@@ -994,16 +994,14 @@ void CommandLineInterface::handleAst(string const& _argStr)
 		for (auto const& sourceCode: m_sourceCodes)
 			asts.push_back(&m_compiler->ast(sourceCode.first));
 		map<ASTNode const*, eth::GasMeter::GasConsumption> gasCosts;
-		// FIXME: shouldn't this be done for every contract?
-		if (m_compiler->runtimeAssemblyItems(m_compiler->lastContractName()))
+		for (auto const& contract : m_compiler->contractNames())
 		{
-			//NOTE: keep the local variable `ret` to prevent a Heisenbug that could happen on certain mac os platform.
-			//See: https://github.com/ethereum/solidity/issues/3718 for details.
 			auto ret = GasEstimator::breakToStatementLevel(
-				GasEstimator(m_evmVersion).structuralEstimation(*m_compiler->runtimeAssemblyItems(m_compiler->lastContractName()), asts),
+				GasEstimator(m_evmVersion).structuralEstimation(*m_compiler->runtimeAssemblyItems(contract), asts),
 				asts
 			);
-			gasCosts = ret;
+			for (auto const& it: ret)
+				gasCosts[it.first] += it.second;
 		}
 
 		bool legacyFormat = !m_args.count(g_argAstCompactJson);

test/cmdlineTests.sh

@@ -292,6 +292,14 @@ SOLTMPDIR=$(mktemp -d)
     if [[ "$result" != 0 ]] ; then
         exit 1
     fi
+
+    # This should not fail
+    set +e
+    output=$(echo '' | "$SOLC" --ast - 2>/dev/null)
+    set -e
+    if [[ $? != 0 ]] ; then
+        exit 1
+    fi
 )
 
 printTask "Testing soljson via the fuzzer..."