Merge remote-tracking branch 'origin/develop' into breaking

libyul/AsmAnalysis.cpp

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Analyzer part of inline assembly.
  */

libyul/AsmAnalysis.h

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Analysis part of inline assembly.
  */

libyul/AsmAnalysisInfo.h

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Information generated during analyzer part of inline assembly.
  */

libyul/AsmData.h

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * @author Christian <c@ethdev.com>
  * @date 2016

libyul/AsmDataForward.h

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * @author Christian <c@ethdev.com>
  * @date 2016

libyul/AsmJsonConverter.cpp

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * @date 2019
  * Converts inline assembly AST to JSON format

libyul/AsmJsonConverter.h

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * @date 2019
  * @author julius <djudju@protonmail.com>

libyul/AsmParser.cpp

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * @author Christian <c@ethdev.com>
  * @date 2016

libyul/AsmParser.h

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * @author Christian <c@ethdev.com>
  * @date 2016

libyul/AsmPrinter.cpp

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * @author Christian <c@ethdev.com>
  * @date 2017

libyul/AsmPrinter.h

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * @author Christian <c@ethdev.com>
  * @date 2017

libyul/AsmScope.cpp

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Scopes for identifiers.
  */

libyul/AsmScope.h

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Scopes for identifiers.
  */

libyul/AsmScopeFiller.cpp

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Module responsible for registering identifiers inside their scopes.
  */

libyul/AsmScopeFiller.h

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Module responsible for registering identifiers inside their scopes.
  */

libyul/AssemblyStack.cpp

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Full assembly stack that can support EVM-assembly and Yul as input and EVM, EVM1.5 and
  * Ewasm as output.

libyul/AssemblyStack.h

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Full assembly stack that can support EVM-assembly and Yul as input and EVM, EVM1.5 and
  * Ewasm as output.

libyul/CompilabilityChecker.cpp

@@ -59,14 +59,7 @@ map<YulString, int> CompilabilityChecker::run(
 			builtinContext,
 			_optimizeStackAllocation
 		);
-		try
-		{
-			transform(*_object.code);
-		}
-		catch (StackTooDeepError const&)
-		{
-			yulAssert(!transform.stackErrors().empty(), "Got stack too deep exception that was not stored.");
-		}
+		transform(*_object.code);
 
 		std::map<YulString, int> functions;
 		for (StackTooDeepError const& error: transform.stackErrors())

libyul/CompilabilityChecker.h

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Component that checks whether all variables are reachable on the stack.
  */

libyul/ControlFlowSideEffects.h

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 
 #pragma once
 

libyul/Dialect.cpp

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Yul dialect.
  */

libyul/Dialect.h

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Yul dialect.
  */

libyul/Exceptions.h

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Exceptions in Yul.
  */

libyul/Object.cpp

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Yul code and data object container.
  */

libyul/Object.h

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Yul code and data object container.
  */

libyul/ObjectParser.cpp

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Parser for Yul code and data object container.
  */

libyul/ObjectParser.h

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Parser for Yul code and data object container.
  */

libyul/SideEffects.h

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 
 #pragma once
 

libyul/Utilities.cpp

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Some useful snippets for the optimiser.
  */

libyul/Utilities.h

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Small useful snippets for the optimiser.
  */

libyul/YulString.h

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * String abstraction that avoids copies.
  */

libyul/backends/evm/AbstractAssembly.h

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * @date 2017
  * Abstract assembly interface, subclasses of which are to be used with the generic
@@ -111,6 +112,9 @@ public:
 	virtual void appendImmutable(std::string const& _identifier) = 0;
 	/// Appends an assignment to an immutable variable.
 	virtual void appendImmutableAssignment(std::string const& _identifier) = 0;
+
+	/// Mark this assembly as invalid. Any attempt to request bytecode from it should throw.
+	virtual void markAsInvalid() = 0;
 };
 
 enum class IdentifierContext { LValue, RValue, VariableDeclaration };

libyul/backends/evm/AsmCodeGen.cpp

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Adaptor between the abstract assembly and eth assembly.
  */
@@ -182,6 +183,11 @@ void EthAssemblyAdapter::appendImmutableAssignment(std::string const& _identifie
 	m_assembly.appendImmutableAssignment(_identifier);
 }
 
+void EthAssemblyAdapter::markAsInvalid()
+{
+	m_assembly.markAsInvalid();
+}
+
 EthAssemblyAdapter::LabelID EthAssemblyAdapter::assemblyTagToIdentifier(evmasm::AssemblyItem const& _tag)
 {
 	u256 id = _tag.data();
@@ -231,18 +237,12 @@ void CodeGenerator::assemble(
 		_identifierAccess,
 		_useNamedLabelsForFunctions
 	);
-	try
-	{
-		transform(_parsedData);
-	}
-	catch (StackTooDeepError const& _e)
-	{
+	transform(_parsedData);
+	if (!transform.stackErrors().empty())
 		assertThrow(
 			false,
 			langutil::StackTooDeepError,
 			"Stack too deep when compiling inline assembly" +
-			(_e.comment() ? ": " + *_e.comment() : ".")
+			(transform.stackErrors().front().comment() ? ": " + *transform.stackErrors().front().comment() : ".")
 		);
-	}
-	yulAssert(transform.stackErrors().empty(), "Stack errors present but not thrown.");
 }

libyul/backends/evm/AsmCodeGen.h

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Adaptor between the abstract assembly and eth assembly.
  */
@@ -64,6 +65,8 @@ public:
 	void appendImmutable(std::string const& _identifier) override;
 	void appendImmutableAssignment(std::string const& _identifier) override;
 
+	void markAsInvalid() override;
+
 private:
 	static LabelID assemblyTagToIdentifier(evmasm::AssemblyItem const& _tag);
 	void appendJumpInstruction(evmasm::Instruction _instruction, JumpType _jumpType);

libyul/backends/evm/ConstantOptimiser.cpp

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Optimisation stage that replaces constants by expressions that compute them.
  */

libyul/backends/evm/ConstantOptimiser.h

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Optimisation stage that replaces constants by expressions that compute them.
  */

libyul/backends/evm/EVMAssembly.cpp

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Assembly interface for EVM and EVM1.5.
  */
@@ -156,6 +157,7 @@ void EVMAssembly::appendReturnsub(int _returns, int _stackDiffAfter)
 
 evmasm::LinkerObject EVMAssembly::finalize()
 {
+	yulAssert(!m_invalid, "Attempted to finalize invalid assembly object.");
 	size_t bytecodeSize = m_bytecode.size();
 	for (auto const& ref: m_assemblySizePositions)
 		updateReference(ref, assemblySizeReferenceSize, u256(bytecodeSize));

libyul/backends/evm/EVMAssembly.h

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Assembly interface for EVM and EVM1.5.
  */
@@ -86,6 +87,8 @@ public:
 	void appendImmutable(std::string const& _identifier) override;
 	void appendImmutableAssignment(std::string const& _identifier) override;
 
+	void markAsInvalid() override { m_invalid = true; }
+
 	/// Resolves references inside the bytecode and returns the linker object.
 	evmasm::LinkerObject finalize();
 
@@ -102,6 +105,7 @@ private:
 	std::map<LabelID, size_t> m_labelPositions;
 	std::map<size_t, LabelID> m_labelReferences;
 	std::vector<size_t> m_assemblySizePositions;
+	bool m_invalid = false;
 };
 
 }

libyul/backends/evm/EVMCodeTransform.cpp

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Common code generator for translating Yul / inline assembly to EVM and EVM1.5.
  */
@@ -237,6 +238,7 @@ void CodeTransform::stackError(StackTooDeepError _error, int _targetStackHeight)
 		m_assembly.appendConstant(u256(0));
 	// Store error.
 	m_stackErrors.emplace_back(std::move(_error));
+	m_assembly.markAsInvalid();
 }
 
 void CodeTransform::operator()(Assignment const& _assignment)
@@ -435,31 +437,28 @@ void CodeTransform::operator()(FunctionDefinition const& _function)
 	m_context->functionExitPoints.push(
 		CodeTransformContext::JumpInfo{m_assembly.newLabelId(), m_assembly.stackHeight()}
 	);
-	try
+	CodeTransform subTransform(
+		m_assembly,
+		m_info,
+		_function.body,
+		m_allowStackOpt,
+		m_dialect,
+		m_builtinContext,
+		m_evm15,
+		m_identifierAccess,
+		m_useNamedLabelsForFunctions,
+		m_context
+	);
+	subTransform(_function.body);
+	if (!subTransform.m_stackErrors.empty())
 	{
-		CodeTransform(
-			m_assembly,
-			m_info,
-			_function.body,
-			m_allowStackOpt,
-			m_dialect,
-			m_builtinContext,
-			m_evm15,
-			m_identifierAccess,
-			m_useNamedLabelsForFunctions,
-			m_context
-		)(_function.body);
-	}
-	catch (StackTooDeepError const& _error)
-	{
-		// This exception will be re-thrown after the end of the surrounding block.
-		// It enables us to see which functions compiled successfully and which did not.
-		// Even if we emit actual code, add an illegal instruction to make sure that tests
-		// will catch it.
-		StackTooDeepError error(_error);
-		if (error.functionName.empty())
-			error.functionName = _function.name;
-		stackError(std::move(error), static_cast<int>(height));
+		m_assembly.markAsInvalid();
+		for (StackTooDeepError& stackError: subTransform.m_stackErrors)
+		{
+			if (stackError.functionName.empty())
+				stackError.functionName = _function.name;
+			m_stackErrors.emplace_back(std::move(stackError));
+		}
 	}
 
 	m_assembly.appendLabel(m_context->functionExitPoints.top().label);
@@ -605,9 +604,6 @@ void CodeTransform::operator()(Block const& _block)
 
 	finalizeBlock(_block, blockStartStackHeight);
 	m_scope = originalScope;
-
-	if (!m_stackErrors.empty())
-		BOOST_THROW_EXCEPTION(m_stackErrors.front());
 }
 
 AbstractAssembly::LabelID CodeTransform::functionEntryID(YulString _name, Scope::Function const& _function)
@@ -728,7 +724,8 @@ size_t CodeTransform::variableHeightDiff(Scope::Variable const& _var, YulString
 			to_string(heightDiff - limit) +
 			" slot(s) too deep inside the stack."
 		);
-		BOOST_THROW_EXCEPTION(m_stackErrors.back());
+		m_assembly.markAsInvalid();
+		return _forSwap ? 2 : 1;
 	}
 	return heightDiff;
 }

libyul/backends/evm/EVMCodeTransform.h

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Common code generator for translating Yul / inline assembly to EVM and EVM1.5.
  */
@@ -201,6 +202,8 @@ private:
 	/// Determines the stack height difference to the given variables. Throws
 	/// if it is not yet in scope or the height difference is too large. Returns
 	/// the (positive) stack height difference otherwise.
+	/// @param _forSwap if true, produces stack error if the difference is invalid for a swap
+	///                 opcode, otherwise checks for validity for a dup opcode.
 	size_t variableHeightDiff(Scope::Variable const& _var, YulString _name, bool _forSwap);
 
 	void expectDeposit(int _deposit, int _oldHeight) const;

libyul/backends/evm/EVMDialect.cpp

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Yul dialects for EVM.
  */

libyul/backends/evm/EVMDialect.h

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Yul dialects for EVM.
  */

libyul/backends/evm/EVMMetrics.cpp

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
 * Module providing metrics for the EVM optimizer.
 */

libyul/backends/evm/EVMMetrics.h

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Module providing metrics for the optimizer.
  */

libyul/backends/evm/EVMObjectCompiler.cpp

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Compiler that transforms Yul Objects to EVM bytecode objects.
  */
@@ -59,5 +60,6 @@ void EVMObjectCompiler::run(Object& _object, bool _optimize)
 	// which should be native to this part of the code.
 	CodeTransform transform{m_assembly, *_object.analysisInfo, *_object.code, m_dialect, context, _optimize, m_evm15};
 	transform(*_object.code);
-	yulAssert(transform.stackErrors().empty(), "Stack errors present but not thrown.");
+	if (!transform.stackErrors().empty())
+		BOOST_THROW_EXCEPTION(transform.stackErrors().front());
 }

libyul/backends/evm/EVMObjectCompiler.h

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Compiler that transforms Yul Objects to EVM bytecode objects.
  */

libyul/backends/evm/NoOutputAssembly.cpp

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Assembly interface that ignores everything. Can be used as a backend for a compilation dry-run.
  */

libyul/backends/evm/NoOutputAssembly.h

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Assembly interface that ignores everything. Can be used as a backend for a compilation dry-run.
  */
@@ -74,6 +75,8 @@ public:
 	void appendImmutable(std::string const& _identifier) override;
 	void appendImmutableAssignment(std::string const& _identifier) override;
 
+	void markAsInvalid() override {}
+
 private:
 	bool m_evm15 = false; ///< if true, switch to evm1.5 mode
 	int m_stackHeight = 0;

libyul/backends/wasm/BinaryTransform.cpp

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Component that transforms internal Wasm representation to binary.
  */

libyul/backends/wasm/BinaryTransform.h

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Component that transforms internal Wasm representation to binary.
  */

libyul/backends/wasm/EVMToEwasmTranslator.cpp

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Translates Yul code from EVM dialect to Ewasm dialect.
  */

libyul/backends/wasm/EVMToEwasmTranslator.h

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Translates Yul code from EVM dialect to Ewasm dialect.
  */

libyul/backends/wasm/TextTransform.cpp

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Component that transforms internal Wasm representation to text.
  */

libyul/backends/wasm/TextTransform.h

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Component that transforms internal Wasm representation to text.
  */

libyul/backends/wasm/WasmAST.h

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Simplified in-memory representation of a Wasm AST.
  */

libyul/backends/wasm/WasmCodeTransform.cpp

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
 * Common code generator for translating Yul / inline assembly to Wasm.
 */

libyul/backends/wasm/WasmCodeTransform.h

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Common code generator for translating Yul / inline assembly to Wasm.
  */

libyul/backends/wasm/WasmDialect.cpp

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Dialects for Wasm.
  */

libyul/backends/wasm/WasmDialect.h

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Dialects for Wasm.
  */

libyul/backends/wasm/WasmObjectCompiler.cpp

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Compiler that transforms Yul Objects to Wasm text and binary representation (Ewasm flavoured).
  */

libyul/backends/wasm/WasmObjectCompiler.h

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Compiler that transforms Yul Objects to Wasm text and binary representation (Ewasm flavoured).
  */

libyul/backends/wasm/WordSizeTransform.cpp

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 
 #include <libyul/AsmData.h>
 #include <libyul/backends/wasm/WordSizeTransform.h>

libyul/backends/wasm/WordSizeTransform.h

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Replace every u256 variable with four u64 variables.
  */

libyul/optimiser/ASTCopier.cpp

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Creates an independent copy of an AST, renaming identifiers to be unique.
  */

libyul/optimiser/ASTCopier.h

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Creates an independent copy of an AST, renaming identifiers to be unique.
  */

libyul/optimiser/ASTWalker.cpp

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Generic AST walker.
  */

libyul/optimiser/ASTWalker.h

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Generic AST walker.
  */

libyul/optimiser/BlockFlattener.cpp

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 #include <libyul/optimiser/BlockFlattener.h>
 #include <libyul/AsmData.h>
 #include <libsolutil/Visitor.h>

libyul/optimiser/BlockFlattener.h

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 #pragma once
 
 #include <libyul/optimiser/ASTWalker.h>

libyul/optimiser/BlockHasher.cpp

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Optimiser component that calculates hash values for block prefixes.
  */

libyul/optimiser/BlockHasher.h

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Optimiser component that calculates hash values for blocks.
  */

libyul/optimiser/CallGraphGenerator.cpp

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Specific AST walker that generates the call graph.
  */

libyul/optimiser/CallGraphGenerator.h

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Specific AST walker that generates the call graph.
  */

libyul/optimiser/CircularReferencesPruner.cpp

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 #include <libyul/optimiser/CircularReferencesPruner.h>
 
 #include <libyul/optimiser/CallGraphGenerator.h>

libyul/optimiser/CircularReferencesPruner.h

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Optimization stage that removes functions that call each other but are
  * otherwise unreferenced.

libyul/optimiser/CommonSubexpressionEliminator.h

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Optimisation stage that replaces expressions known to be the current value of a variable
  * in scope by a reference to that variable.

libyul/optimiser/ConditionalSimplifier.cpp

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 #include <libyul/optimiser/ConditionalSimplifier.h>
 #include <libyul/optimiser/Semantics.h>
 #include <libyul/AsmData.h>

libyul/optimiser/ConditionalSimplifier.h

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 #pragma once
 
 #include <libyul/optimiser/ASTWalker.h>

libyul/optimiser/ConditionalUnsimplifier.cpp

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 #include <libyul/optimiser/ConditionalUnsimplifier.h>
 #include <libyul/optimiser/Semantics.h>
 #include <libyul/AsmData.h>

libyul/optimiser/ConditionalUnsimplifier.h

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 #pragma once
 
 #include <libyul/optimiser/ASTWalker.h>

libyul/optimiser/ControlFlowSimplifier.cpp

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 #include <libyul/optimiser/ControlFlowSimplifier.h>
 #include <libyul/optimiser/Semantics.h>
 #include <libyul/optimiser/OptimiserStep.h>

libyul/optimiser/ControlFlowSimplifier.h

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 #pragma once
 
 #include <libyul/optimiser/ASTWalker.h>

libyul/optimiser/DataFlowAnalyzer.h

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Base class to perform data flow analysis during AST walks.
  * Tracks assignments and is used as base class for both Rematerialiser and

libyul/optimiser/DeadCodeEliminator.cpp

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Optimisation stage that removes unreachable code.
  */

libyul/optimiser/DeadCodeEliminator.h

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Optimisation stage that removes unused variables and functions.
  */

libyul/optimiser/Disambiguator.cpp

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Optimiser component that makes all identifiers unique.
  */

libyul/optimiser/Disambiguator.h

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Optimiser component that makes all identifiers unique.
  */

libyul/optimiser/EquivalentFunctionCombiner.cpp

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Optimiser component that combines syntactically equivalent functions.
  */

libyul/optimiser/EquivalentFunctionCombiner.h

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Optimiser component that combines syntactically equivalent functions.
  */

libyul/optimiser/EquivalentFunctionDetector.cpp

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Optimiser component that combines syntactically equivalent functions.
  */

libyul/optimiser/EquivalentFunctionDetector.h

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Optimiser component that combines syntactically equivalent functions.
  */

libyul/optimiser/ExpressionInliner.cpp

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Optimiser component that performs function inlining inside expressions.
  */

libyul/optimiser/ExpressionInliner.h

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Optimiser component that performs function inlining.
  */

libyul/optimiser/ExpressionJoiner.cpp

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Optimiser component that undoes what the ExpressionSplitter did, i.e.
  * it more or less inlines variable declarations.

libyul/optimiser/ExpressionJoiner.h

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Optimiser component that undoes what the ExpressionSplitter did, i.e.
  * it more or less inlines variable declarations.

libyul/optimiser/ExpressionSimplifier.cpp

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Optimiser component that uses the simplification rules to simplify expressions.
  */

libyul/optimiser/ExpressionSimplifier.h

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Optimiser component that uses the simplification rules to simplify expressions.
  */

libyul/optimiser/ExpressionSplitter.cpp

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Optimiser component that turns complex expressions into multiple variable
  * declarations.

libyul/optimiser/ExpressionSplitter.h

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 /**
  * Optimiser component that turns complex expressions into multiple variable
  * declarations.

libyul/optimiser/ForLoopConditionIntoBody.cpp

@@ -14,6 +14,7 @@
 	You should have received a copy of the GNU General Public License
 	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
 */
+// SPDX-License-Identifier: GPL-3.0
 
 #include <libyul/optimiser/ForLoopConditionIntoBody.h>
 #include <libyul/optimiser/OptimiserStep.h>