Merge pull request #5681 from ethereum/limitOutput

Do not compile unless requested.

12 files changed, 160 insertions, 23 deletions

diff --git a/Changelog.md b/Changelog.md
index 60e3904c..428a0be0 100644
--- a/Changelog.md
+++ b/Changelog.md
@@ -11,6 +11,7 @@ Compiler Features:
  * Code Generator: Use binary search for dispatch function if more efficient. The size/speed tradeoff can be tuned using ``--optimize-runs``.
  * Compiler Interface: Disallow unknown keys in standard JSON input.
  * SMTChecker: Support mathematical and cryptographic functions in an uninterpreted way.
+ * Standard JSON interface: Only run code generation if it has been requested. This could lead to unsupported feature errors only being reported at the point where you request bytecode.
  * Static Analyzer: Do not warn about unused variables or state mutability for functions with an empty body.
  * Type Checker: Add an additional reason to be displayed when type conversion fails.
  * Yul: Support object access via ``datasize``, ``dataoffset`` and ``datacopy`` in standalone assembly mode.
diff --git a/libsolidity/interface/CompilerStack.cpp b/libsolidity/interface/CompilerStack.cpp
index adfb94bd..f9d889e7 100644
--- a/libsolidity/interface/CompilerStack.cpp
+++ b/libsolidity/interface/CompilerStack.cpp
@@ -389,18 +389,27 @@ string const CompilerStack::lastContractName() const
 
 eth::AssemblyItems const* CompilerStack::assemblyItems(string const& _contractName) const
 {
+	if (m_stackState != CompilationSuccessful)
+		BOOST_THROW_EXCEPTION(CompilerError() << errinfo_comment("Compilation was not successful."));
+
 	Contract const& currentContract = contract(_contractName);
 	return currentContract.compiler ? &contract(_contractName).compiler->assemblyItems() : nullptr;
 }
 
 eth::AssemblyItems const* CompilerStack::runtimeAssemblyItems(string const& _contractName) const
 {
+	if (m_stackState != CompilationSuccessful)
+		BOOST_THROW_EXCEPTION(CompilerError() << errinfo_comment("Compilation was not successful."));
+
 	Contract const& currentContract = contract(_contractName);
 	return currentContract.compiler ? &contract(_contractName).compiler->runtimeAssemblyItems() : nullptr;
 }
 
 string const* CompilerStack::sourceMapping(string const& _contractName) const
 {
+	if (m_stackState != CompilationSuccessful)
+		BOOST_THROW_EXCEPTION(CompilerError() << errinfo_comment("Compilation was not successful."));
+
 	Contract const& c = contract(_contractName);
 	if (!c.sourceMapping)
 	{
@@ -412,6 +421,9 @@ string const* CompilerStack::sourceMapping(string const& _contractName) const
 
 string const* CompilerStack::runtimeSourceMapping(string const& _contractName) const
 {
+	if (m_stackState != CompilationSuccessful)
+		BOOST_THROW_EXCEPTION(CompilerError() << errinfo_comment("Compilation was not successful."));
+
 	Contract const& c = contract(_contractName);
 	if (!c.runtimeSourceMapping)
 	{
@@ -447,17 +459,26 @@ std::string const CompilerStack::filesystemFriendlyName(string const& _contractN
 
 eth::LinkerObject const& CompilerStack::object(string const& _contractName) const
 {
+	if (m_stackState != CompilationSuccessful)
+		BOOST_THROW_EXCEPTION(CompilerError() << errinfo_comment("Compilation was not successful."));
+
 	return contract(_contractName).object;
 }
 
 eth::LinkerObject const& CompilerStack::runtimeObject(string const& _contractName) const
 {
+	if (m_stackState != CompilationSuccessful)
+		BOOST_THROW_EXCEPTION(CompilerError() << errinfo_comment("Compilation was not successful."));
+
 	return contract(_contractName).runtimeObject;
 }
 
 /// FIXME: cache this string
 string CompilerStack::assemblyString(string const& _contractName, StringMap _sourceCodes) const
 {
+	if (m_stackState != CompilationSuccessful)
+		BOOST_THROW_EXCEPTION(CompilerError() << errinfo_comment("Compilation was not successful."));
+
 	Contract const& currentContract = contract(_contractName);
 	if (currentContract.compiler)
 		return currentContract.compiler->assemblyString(_sourceCodes);
@@ -468,6 +489,9 @@ string CompilerStack::assemblyString(string const& _contractName, StringMap _sou
 /// FIXME: cache the JSON
 Json::Value CompilerStack::assemblyJSON(string const& _contractName, StringMap _sourceCodes) const
 {
+	if (m_stackState != CompilationSuccessful)
+		BOOST_THROW_EXCEPTION(CompilerError() << errinfo_comment("Compilation was not successful."));
+
 	Contract const& currentContract = contract(_contractName);
 	if (currentContract.compiler)
 		return currentContract.compiler->assemblyJSON(_sourceCodes);
@@ -494,13 +518,16 @@ map<string, unsigned> CompilerStack::sourceIndices() const
 
 Json::Value const& CompilerStack::contractABI(string const& _contractName) const
 {
+	if (m_stackState < AnalysisSuccessful)
+		BOOST_THROW_EXCEPTION(CompilerError() << errinfo_comment("Analysis was not successful."));
+
 	return contractABI(contract(_contractName));
 }
 
 Json::Value const& CompilerStack::contractABI(Contract const& _contract) const
 {
 	if (m_stackState < AnalysisSuccessful)
-		BOOST_THROW_EXCEPTION(CompilerError() << errinfo_comment("Parsing was not successful."));
+		BOOST_THROW_EXCEPTION(CompilerError() << errinfo_comment("Analysis was not successful."));
 
 	solAssert(_contract.contract, "");
 
@@ -513,13 +540,16 @@ Json::Value const& CompilerStack::contractABI(Contract const& _contract) const
 
 Json::Value const& CompilerStack::natspecUser(string const& _contractName) const
 {
+	if (m_stackState < AnalysisSuccessful)
+		BOOST_THROW_EXCEPTION(CompilerError() << errinfo_comment("Analysis was not successful."));
+
 	return natspecUser(contract(_contractName));
 }
 
 Json::Value const& CompilerStack::natspecUser(Contract const& _contract) const
 {
 	if (m_stackState < AnalysisSuccessful)
-		BOOST_THROW_EXCEPTION(CompilerError() << errinfo_comment("Parsing was not successful."));
+		BOOST_THROW_EXCEPTION(CompilerError() << errinfo_comment("Analysis was not successful."));
 
 	solAssert(_contract.contract, "");
 
@@ -532,13 +562,16 @@ Json::Value const& CompilerStack::natspecUser(Contract const& _contract) const
 
 Json::Value const& CompilerStack::natspecDev(string const& _contractName) const
 {
+	if (m_stackState < AnalysisSuccessful)
+		BOOST_THROW_EXCEPTION(CompilerError() << errinfo_comment("Analysis was not successful."));
+
 	return natspecDev(contract(_contractName));
 }
 
 Json::Value const& CompilerStack::natspecDev(Contract const& _contract) const
 {
 	if (m_stackState < AnalysisSuccessful)
-		BOOST_THROW_EXCEPTION(CompilerError() << errinfo_comment("Parsing was not successful."));
+		BOOST_THROW_EXCEPTION(CompilerError() << errinfo_comment("Analysis was not successful."));
 
 	solAssert(_contract.contract, "");
 
@@ -551,6 +584,9 @@ Json::Value const& CompilerStack::natspecDev(Contract const& _contract) const
 
 Json::Value CompilerStack::methodIdentifiers(string const& _contractName) const
 {
+	if (m_stackState < AnalysisSuccessful)
+		BOOST_THROW_EXCEPTION(CompilerError() << errinfo_comment("Analysis was not successful."));
+
 	Json::Value methodIdentifiers(Json::objectValue);
 	for (auto const& it: contractDefinition(_contractName).interfaceFunctions())
 		methodIdentifiers[it.second->externalSignature()] = it.first.hex();
@@ -583,8 +619,8 @@ SourceUnit const& CompilerStack::ast(string const& _sourceName) const
 
 ContractDefinition const& CompilerStack::contractDefinition(string const& _contractName) const
 {
-	if (m_stackState != CompilationSuccessful)
-		BOOST_THROW_EXCEPTION(CompilerError() << errinfo_comment("Compilation was not successful."));
+	if (m_stackState < AnalysisSuccessful)
+		BOOST_THROW_EXCEPTION(CompilerError() << errinfo_comment("Analysis was not successful."));
 
 	return *contract(_contractName).contract;
 }
@@ -594,6 +630,9 @@ size_t CompilerStack::functionEntryPoint(
 	FunctionDefinition const& _function
 ) const
 {
+	if (m_stackState != CompilationSuccessful)
+		BOOST_THROW_EXCEPTION(CompilerError() << errinfo_comment("Compilation was not successful."));
+
 	shared_ptr<Compiler> const& compiler = contract(_contractName).compiler;
 	if (!compiler)
 		return 0;
@@ -936,6 +975,9 @@ bytes CompilerStack::createCBORMetadata(string const& _metadata, bool _experimen
 
 string CompilerStack::computeSourceMapping(eth::AssemblyItems const& _items) const
 {
+	if (m_stackState != CompilationSuccessful)
+		BOOST_THROW_EXCEPTION(CompilerError() << errinfo_comment("Compilation was not successful."));
+
 	string ret;
 	map<string, unsigned> sourceIndicesMap = sourceIndices();
 	int prevStart = -1;
@@ -1022,6 +1064,9 @@ Json::Value gasToJson(GasEstimator::GasConsumption const& _gas)
 
 Json::Value CompilerStack::gasEstimates(string const& _contractName) const
 {
+	if (m_stackState != CompilationSuccessful)
+		BOOST_THROW_EXCEPTION(CompilerError() << errinfo_comment("Compilation was not successful."));
+
 	if (!assemblyItems(_contractName) && !runtimeAssemblyItems(_contractName))
 		return Json::Value();
 
diff --git a/libsolidity/interface/StandardCompiler.cpp b/libsolidity/interface/StandardCompiler.cpp
index e99b1324..137a4439 100644
--- a/libsolidity/interface/StandardCompiler.cpp
+++ b/libsolidity/interface/StandardCompiler.cpp
@@ -28,6 +28,7 @@
 #include <libdevcore/JSON.h>
 #include <libdevcore/Keccak256.h>
 
+#include <boost/algorithm/cxx11/any_of.hpp>
 #include <boost/algorithm/string.hpp>
 #include <boost/optional.hpp>
 #include <algorithm>
@@ -191,6 +192,31 @@ bool isArtifactRequested(Json::Value const& _outputSelection, string const& _fil
 	return false;
 }
 
+/// @returns true if any binary was requested, i.e. we actually have to perform compilation.
+bool isBinaryRequested(Json::Value const& _outputSelection)
+{
+	if (!_outputSelection.isObject())
+		return false;
+
+	// This does not inculde "evm.methodIdentifiers" on purpose!
+	static vector<string> const outputsThatRequireBinaries{
+		"*",
+		"metadata", // This is only generated at the end of compilation, but could be generated earlier.
+		"evm.deployedBytecode", "evm.deployedBytecode.object", "evm.deployedBytecode.opcodes",
+		"evm.deployedBytecode.sourceMap", "evm.deployedBytecode.linkReferences",
+		"evm.bytecode", "evm.bytecode.object", "evm.bytecode.opcodes", "evm.bytecode.sourceMap",
+		"evm.bytecode.linkReferences",
+		"evm.gasEstimates", "evm.legacyAssembly", "evm.assembly"
+	};
+
+	for (auto const& fileRequests: _outputSelection)
+		for (auto const& requests: fileRequests)
+			for (auto const& output: outputsThatRequireBinaries)
+				if (isArtifactRequested(requests, output))
+					return true;
+	return false;
+}
+
 Json::Value formatLinkReferences(std::map<size_t, std::string> const& linkReferences)
 {
 	Json::Value ret(Json::objectValue);
@@ -564,9 +590,14 @@ Json::Value StandardCompiler::compileInternal(Json::Value const& _input)
 
 	m_compilerStack.setRequestedContractNames(requestedContractNames(outputSelection));
 
+	bool const binariesRequested = isBinaryRequested(outputSelection);
+
 	try
 	{
-		m_compilerStack.compile();
+		if (binariesRequested)
+			m_compilerStack.compile();
+		else
+			m_compilerStack.parseAndAnalyze();
 
 		for (auto const& error: m_compilerStack.errors())
 		{
@@ -655,7 +686,7 @@ Json::Value StandardCompiler::compileInternal(Json::Value const& _input)
 	bool const compilationSuccess = m_compilerStack.state() == CompilerStack::State::CompilationSuccessful;
 
 	/// Inconsistent state - stop here to receive error reports from users
-	if (!compilationSuccess && errors.empty())
+	if (((binariesRequested && !compilationSuccess) || !analysisSuccess) && errors.empty())
 		return formatFatalError("InternalCompilerError", "No error reported, but compilation failed.");
 
 	Json::Value output = Json::objectValue;
@@ -681,7 +712,7 @@ Json::Value StandardCompiler::compileInternal(Json::Value const& _input)
 	}
 
 	Json::Value contractsOutput = Json::objectValue;
-	for (string const& contractName: compilationSuccess ? m_compilerStack.contractNames() : vector<string>())
+	for (string const& contractName: analysisSuccess ? m_compilerStack.contractNames() : vector<string>())
 	{
 		size_t colon = contractName.rfind(':');
 		solAssert(colon != string::npos, "");
@@ -692,7 +723,7 @@ Json::Value StandardCompiler::compileInternal(Json::Value const& _input)
 		Json::Value contractData(Json::objectValue);
 		if (isArtifactRequested(outputSelection, file, name, "abi"))
 			contractData["abi"] = m_compilerStack.contractABI(contractName);
-		if (isArtifactRequested(outputSelection, file, name, "metadata"))
+		if (compilationSuccess && isArtifactRequested(outputSelection, file, name, "metadata"))
 			contractData["metadata"] = m_compilerStack.metadata(contractName);
 		if (isArtifactRequested(outputSelection, file, name, "userdoc"))
 			contractData["userdoc"] = m_compilerStack.natspecUser(contractName);
@@ -702,16 +733,16 @@ Json::Value StandardCompiler::compileInternal(Json::Value const& _input)
 		// EVM
 		Json::Value evmData(Json::objectValue);
 		// @TODO: add ir
-		if (isArtifactRequested(outputSelection, file, name, "evm.assembly"))
+		if (compilationSuccess && isArtifactRequested(outputSelection, file, name, "evm.assembly"))
 			evmData["assembly"] = m_compilerStack.assemblyString(contractName, createSourceList(_input));
-		if (isArtifactRequested(outputSelection, file, name, "evm.legacyAssembly"))
+		if (compilationSuccess && isArtifactRequested(outputSelection, file, name, "evm.legacyAssembly"))
 			evmData["legacyAssembly"] = m_compilerStack.assemblyJSON(contractName, createSourceList(_input));
 		if (isArtifactRequested(outputSelection, file, name, "evm.methodIdentifiers"))
 			evmData["methodIdentifiers"] = m_compilerStack.methodIdentifiers(contractName);
-		if (isArtifactRequested(outputSelection, file, name, "evm.gasEstimates"))
+		if (compilationSuccess && isArtifactRequested(outputSelection, file, name, "evm.gasEstimates"))
 			evmData["gasEstimates"] = m_compilerStack.gasEstimates(contractName);
 
-		if (isArtifactRequested(
+		if (compilationSuccess && isArtifactRequested(
 			outputSelection,
 			file,
 			name,
@@ -722,7 +753,7 @@ Json::Value StandardCompiler::compileInternal(Json::Value const& _input)
 				m_compilerStack.sourceMapping(contractName)
 			);
 
-		if (isArtifactRequested(
+		if (compilationSuccess && isArtifactRequested(
 			outputSelection,
 			file,
 			name,
@@ -733,14 +764,18 @@ Json::Value StandardCompiler::compileInternal(Json::Value const& _input)
 				m_compilerStack.runtimeSourceMapping(contractName)
 			);
 
-		contractData["evm"] = evmData;
+		if (!evmData.empty())
+			contractData["evm"] = evmData;
 
-		if (!contractsOutput.isMember(file))
-			contractsOutput[file] = Json::objectValue;
-
-		contractsOutput[file][name] = contractData;
+		if (!contractData.empty())
+		{
+			if (!contractsOutput.isMember(file))
+				contractsOutput[file] = Json::objectValue;
+			contractsOutput[file][name] = contractData;
+		}
 	}
-	output["contracts"] = contractsOutput;
+	if (!contractsOutput.empty())
+		output["contracts"] = contractsOutput;
 
 	return output;
 }
diff --git a/test/cmdlineTests.sh b/test/cmdlineTests.sh
index bb71e012..9d2ffa5f 100755
--- a/test/cmdlineTests.sh
+++ b/test/cmdlineTests.sh
@@ -132,7 +132,7 @@ test_solc_behaviour() {
 
     if [[ "$solc_args" == *"--standard-json"* ]]; then
         sed -i -e 's/{[^{]*Warning: This is a pre-release compiler version[^}]*},\{0,1\}//' "$stdout_path"
-        sed -i -e 's/,"errors":\[\]//' "$stdout_path"
+        sed -i -e 's/"errors":\[\],\{0,1\}//' "$stdout_path"
     else
         sed -i -e '/^Warning: This is a pre-release compiler version, please do not use it in production./d' "$stderr_path"
         sed -i -e 's/ Consider adding "pragma .*$//' "$stderr_path"
diff --git a/test/cmdlineTests/standard.json.stdout b/test/cmdlineTests/standard.json.stdout
index 490e1f80..59b90c8c 100644
--- a/test/cmdlineTests/standard.json.stdout
+++ b/test/cmdlineTests/standard.json.stdout
@@ -1 +1 @@
-{"contracts":{"A":{"C":{"evm":{}}}},"sources":{"A":{"id":0}}}
+{"sources":{"A":{"id":0}}}
diff --git a/test/cmdlineTests/standard_binaries_requested.json b/test/cmdlineTests/standard_binaries_requested.json
new file mode 100644
index 00000000..65f19543
--- /dev/null
+++ b/test/cmdlineTests/standard_binaries_requested.json
@@ -0,0 +1,17 @@
+{
+	"language": "Solidity",
+	"sources":
+	{
+		"A":
+		{
+			"content": "pragma solidity >=0.0; contract C { function f() public pure {} }"
+		}
+	},
+	"settings":
+	{
+		"outputSelection":
+		{
+			"*": { "*": ["evm.gasEstimates"] }
+		}
+	}
+}
diff --git a/test/cmdlineTests/standard_binaries_requested.json.stdout b/test/cmdlineTests/standard_binaries_requested.json.stdout
new file mode 100644
index 00000000..2baef22a
--- /dev/null
+++ b/test/cmdlineTests/standard_binaries_requested.json.stdout
@@ -0,0 +1 @@
+{"contracts":{"A":{"C":{"evm":{"gasEstimates":{"creation":{"codeDepositCost":"25600","executionCost":"75","totalCost":"25675"},"external":{"f()":"127"}}}}}},"sources":{"A":{"id":0}}}
\ No newline at end of file
diff --git a/test/cmdlineTests/standard_methodIdentifiersRequested.json b/test/cmdlineTests/standard_methodIdentifiersRequested.json
new file mode 100644
index 00000000..79a3c75d
--- /dev/null
+++ b/test/cmdlineTests/standard_methodIdentifiersRequested.json
@@ -0,0 +1,17 @@
+{
+	"language": "Solidity",
+	"sources":
+	{
+		"A":
+		{
+			"content": "pragma solidity >=0.0; contract C { function f() public pure {} }"
+		}
+	},
+	"settings":
+	{
+		"outputSelection":
+		{
+			"*": { "*": ["evm.methodIdentifiers"] }
+		}
+	}
+}
diff --git a/test/cmdlineTests/standard_methodIdentifiersRequested.json.stdout b/test/cmdlineTests/standard_methodIdentifiersRequested.json.stdout
new file mode 100644
index 00000000..7e3f139f
--- /dev/null
+++ b/test/cmdlineTests/standard_methodIdentifiersRequested.json.stdout
@@ -0,0 +1 @@
+{"contracts":{"A":{"C":{"evm":{"methodIdentifiers":{"f()":"26121ff0"}}}}},"sources":{"A":{"id":0}}}
diff --git a/test/cmdlineTests/standard_only_ast_requested.json b/test/cmdlineTests/standard_only_ast_requested.json
new file mode 100644
index 00000000..7abd6da5
--- /dev/null
+++ b/test/cmdlineTests/standard_only_ast_requested.json
@@ -0,0 +1,17 @@
+{
+	"language": "Solidity",
+	"sources":
+	{
+		"A":
+		{
+			"content": "pragma solidity >=0.0; contract C { function f() public pure {} }"
+		}
+	},
+	"settings":
+	{
+		"outputSelection":
+		{
+			"*": { "": ["ast"] }
+		}
+	}
+}
diff --git a/test/cmdlineTests/standard_only_ast_requested.json.stdout b/test/cmdlineTests/standard_only_ast_requested.json.stdout
new file mode 100644
index 00000000..b884ab7d
--- /dev/null
+++ b/test/cmdlineTests/standard_only_ast_requested.json.stdout
@@ -0,0 +1 @@
+{"sources":{"A":{"ast":{"absolutePath":"A","exportedSymbols":{"C":[6]},"id":7,"nodeType":"SourceUnit","nodes":[{"id":1,"literals":["solidity",">=","0.0"],"nodeType":"PragmaDirective","src":"0:22:0"},{"baseContracts":[],"contractDependencies":[],"contractKind":"contract","documentation":null,"fullyImplemented":true,"id":6,"linearizedBaseContracts":[6],"name":"C","nodeType":"ContractDefinition","nodes":[{"body":{"id":4,"nodeType":"Block","src":"61:2:0","statements":[]},"documentation":null,"id":5,"implemented":true,"kind":"function","modifiers":[],"name":"f","nodeType":"FunctionDefinition","parameters":{"id":2,"nodeType":"ParameterList","parameters":[],"src":"46:2:0"},"returnParameters":{"id":3,"nodeType":"ParameterList","parameters":[],"src":"61:0:0"},"scope":6,"src":"36:27:0","stateMutability":"pure","superFunction":null,"visibility":"public"}],"scope":7,"src":"23:42:0"}],"src":"0:65:0"},"id":0}}}
diff --git a/test/libsolidity/LibSolc.cpp b/test/libsolidity/LibSolc.cpp
index 09c08700..ec97f22f 100644
--- a/test/libsolidity/LibSolc.cpp
+++ b/test/libsolidity/LibSolc.cpp
@@ -81,7 +81,9 @@ BOOST_AUTO_TEST_CASE(standard_compilation)
 
 	// Only tests some assumptions. The StandardCompiler is tested properly in another suite.
 	BOOST_CHECK(result.isMember("sources"));
-	BOOST_CHECK(result.isMember("contracts"));
+	// This used to test that it is a member, but we did not actually request any output,
+	// so there should not be a contract member.
+	BOOST_CHECK(!result.isMember("contracts"));
 }
 
 BOOST_AUTO_TEST_SUITE_END()