Class ControlFlowChainGenerator

java.lang.Object

org.ek9lang.compiler.phase7.generator.AbstractGenerator

org.ek9lang.compiler.phase7.generator.ControlFlowChainGenerator

All Implemented Interfaces:

Function<ControlFlowChainDetails, List<IRInstr>>

public final class ControlFlowChainGenerator
extends AbstractGenerator
implements Function<ControlFlowChainDetails, List<IRInstr>>

Unified generator for all EK9 control flow constructs using CONTROL_FLOW_CHAIN.

This generator replaces multiple specialized generators:
- QuestionBlockGenerator → generateQuestionOperator()
- GuardedAssignmentBlockGenerator → generateGuardedAssignment()
- Future: If/else and switch statement generators

Key architectural benefits:
- Single source of truth for all control flow logic
- Consistent memory management patterns across all constructs
- Unified optimization metadata for backend code generation
- Reduced code duplication and maintenance burden

Field Summary

Fields inherited from class AbstractGenerator

debugInfoCreator, instructionBuilder, stackContext

Constructor Summary

Constructors

Constructor	Description
ControlFlowChainGenerator(IRGenerationContext stackContext, Function<ExprProcessingDetails, List<IRInstr>> rawExprProcessor)

Method Summary

Modifier and Type	Method	Description
List<IRInstr>	apply(ControlFlowChainDetails details)
List<IRInstr>	generateGuardedAssignment(ISymbol lhsSymbol, List<IRInstr> assignmentEvaluation, String assignmentResult, DebugInfo debugInfo)	Generate SWITCH_CHAIN_BLOCK for guarded assignment (:=?).
List<IRInstr>	generateQuestionOperator(ExprProcessingDetails exprDetails)	Generate SWITCH_CHAIN_BLOCK for Question operator (?).
List<IRInstr>	generateQuestionOperatorForVariable(ISymbol variableSymbol, String resultVariable, DebugInfo debugInfo)	Generate SWITCH_CHAIN_BLOCK for Question operator applied to a variable.

Methods inherited from class AbstractGenerator

extractCallMetaData, getRecordedSymbolOrException

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface Function

andThen, compose

Constructor Details

ControlFlowChainGenerator

public ControlFlowChainGenerator(IRGenerationContext stackContext,
 Function<ExprProcessingDetails, List<IRInstr>> rawExprProcessor)

Method Details

apply

public List<IRInstr> apply(ControlFlowChainDetails details)

Specified by:

apply in interface Function<ControlFlowChainDetails, List<IRInstr>>

generateQuestionOperator

public List<IRInstr> generateQuestionOperator(ExprProcessingDetails exprDetails)

Generate SWITCH_CHAIN_BLOCK for Question operator (?). Converts "operand?" to a two-case chain: null check + _isSet() default. Question operator is self-contained - no RETAIN/SCOPE_REGISTER needed on input.

generateQuestionOperatorForVariable

public List<IRInstr> generateQuestionOperatorForVariable(ISymbol variableSymbol,
 String resultVariable,
 DebugInfo debugInfo)

Generate SWITCH_CHAIN_BLOCK for Question operator applied to a variable. Used by guarded assignment composition.

generateGuardedAssignment

public List<IRInstr> generateGuardedAssignment(ISymbol lhsSymbol,
 List<IRInstr> assignmentEvaluation,
 String assignmentResult,
 DebugInfo debugInfo)

Generate SWITCH_CHAIN_BLOCK for guarded assignment (:=?). Composes question operator logic: assign only if LHS is null OR !LHS._isSet().