Yul: copy verbatim functions into no output assembly

ethereum · Aug 26, 2024 · dec3a9d · dec3a9d
1 parent 737b75f
commit dec3a9d
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diff --git a/libyul/backends/evm/EVMDialect.h b/libyul/backends/evm/EVMDialect.h
@@ -105,6 +105,8 @@ struct EVMDialect: public Dialect
 
 	static SideEffects sideEffectsOfInstruction(evmasm::Instruction _instruction);
 
+	std::map<std::pair<size_t, size_t>, BuiltinFunctionForEVM> const& verbatimFunctions() const { return m_verbatimFunctions; }
+
 protected:
 	VerbatimHandle verbatimFunction(size_t _arguments, size_t _returnVariables) const;
 

diff --git a/libyul/backends/evm/NoOutputAssembly.cpp b/libyul/backends/evm/NoOutputAssembly.cpp
@@ -148,4 +148,17 @@ NoOutputEVMDialect::NoOutputEVMDialect(EVMDialect const& _copyFrom):
 			};
 		}
 	}
+
+	m_verbatimFunctions = _copyFrom.verbatimFunctions();
+	for (auto &[numArgsRets, fun]: m_verbatimFunctions)
+	{
+		fun.generateCode = [numArgs=numArgsRets.first, numRets=numArgsRets.second](FunctionCall const&, AbstractAssembly& _assembly, BuiltinContext&)
+		{
+			for (size_t i = 0; i < numArgs; i++)
+				_assembly.appendInstruction(evmasm::Instruction::POP);
+
+			for (size_t i = 0; i < numRets; i++)
+				_assembly.appendConstant(u256(0));
+		};
+	}
 }