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* Control Flow Statement Generators (ADR-053 A3)
*
* Generates C code for control flow statements:
* - return statements
* - if/else statements
* - while loops
* - do-while loops
* - for loops
*/
import {
ReturnStatementContext,
IfStatementContext,
WhileStatementContext,
DoWhileStatementContext,
ForStatementContext,
ForeverStatementContext,
ForVarDeclContext,
ForAssignmentContext,
ExpressionContext,
} from "../../../../logic/parser/grammar/CNextParser";
import IGeneratorOutput from "../IGeneratorOutput";
import TGeneratorEffect from "../TGeneratorEffect";
import IGeneratorInput from "../IGeneratorInput";
import IGeneratorState from "../IGeneratorState";
import IOrchestrator from "../IOrchestrator";
import VariableModifierBuilder from "../../helpers/VariableModifierBuilder";
import ExpressionUtils from "../../../../../utils/ExpressionUtils";
import ASSIGNMENT_OPERATOR_MAP from "../../../../../utils/constants/OperatorMappings";
/**
* Issue #477: Check if a simple identifier is an unqualified enum member.
* Throws an error with helpful suggestion if found.
*/
function rejectUnqualifiedEnumInReturn(
simpleId: string,
symbols: IGeneratorInput["symbols"],
exprCtx: ExpressionContext,
): void {
Iif (!symbols) return;
for (const [enumName, members] of symbols.enumMembers) {
if (members.has(simpleId)) {
const line = exprCtx.start?.line ?? 0;
const col = exprCtx.start?.column ?? 0;
throw new Error(
`${line}:${col} error[E0424]: '${simpleId}' is not defined; did you mean '${enumName}.${simpleId}'?`,
);
}
}
}
/**
* Generate C code for a return statement.
* Issue #477: Uses function return type as expected type for enum inference.
*/
const generateReturn = (
node: ReturnStatementContext,
input: IGeneratorInput,
_state: IGeneratorState,
orchestrator: IOrchestrator,
): IGeneratorOutput => {
const effects: TGeneratorEffect[] = [];
if (!node.expression()) {
return { code: "return;", effects };
}
// Issue #477: Get function return type for enum inference
const returnType = orchestrator.getCurrentFunctionReturnType();
const exprCtx = node.expression()!;
const returnTypeIsEnum =
returnType && input.symbols?.knownEnums.has(returnType);
// Issue #477: Validate unqualified enum in non-enum return context
// Use ExpressionUtils to check for simple identifier (no binary ops, no postfix)
if (!returnTypeIsEnum) {
const simpleId = ExpressionUtils.extractIdentifier(exprCtx);
if (simpleId) {
rejectUnqualifiedEnumInReturn(simpleId, input.symbols, exprCtx);
}
}
// Set expectedType if return type is enum (enables unqualified enum returns)
const expr = returnTypeIsEnum
? orchestrator.generateExpressionWithExpectedType(exprCtx, returnType)
: orchestrator.generateExpression(exprCtx);
return { code: `return ${expr};`, effects };
};
/**
* Generate C code for an if statement.
* Includes strlen optimization for repeated .length accesses.
*/
const generateIf = (
node: IfStatementContext,
_input: IGeneratorInput,
_state: IGeneratorState,
orchestrator: IOrchestrator,
): IGeneratorOutput => {
const effects: TGeneratorEffect[] = [];
const statements = node.statement();
// Analyze condition and body for repeated .length accesses (strlen optimization)
const lengthCounts = orchestrator.countStringLengthAccesses(
node.expression(),
);
// Also count in the then branch if it's a block
const thenStmt = statements[0];
if (thenStmt.block()) {
orchestrator.countBlockLengthAccesses(thenStmt.block()!, lengthCounts);
}
// Set up cache and generate declarations
const cacheDecls = orchestrator.setupLengthCache(lengthCounts);
// Issue #254: Validate no function calls in condition (E0702)
orchestrator.validateConditionNoFunctionCall(node.expression(), "if");
// Issue #884: Validate condition is a boolean expression (E0701)
orchestrator.validateConditionIsBoolean(node.expression(), "if");
// Generate with cache enabled
const condition = orchestrator.generateExpression(node.expression());
// Issue #250: Flush any temp vars from condition BEFORE generating branches
const conditionTemps = orchestrator.flushPendingTempDeclarations();
const thenBranch = orchestrator.generateStatement(thenStmt);
let result = `if (${condition}) ${thenBranch}`;
if (statements.length > 1) {
const elseBranch = orchestrator.generateStatement(statements[1]);
result += ` else ${elseBranch}`;
}
// Clear cache after generating
orchestrator.clearLengthCache();
// Prepend condition temps and cache declarations
if (conditionTemps) {
result = conditionTemps + "\n" + result;
}
if (cacheDecls) {
result = cacheDecls + result;
}
return { code: result, effects };
};
/**
* Generate C code for a while statement.
*/
const generateWhile = (
node: WhileStatementContext,
_input: IGeneratorInput,
_state: IGeneratorState,
orchestrator: IOrchestrator,
): IGeneratorOutput => {
const effects: TGeneratorEffect[] = [];
// Issue #254: Validate no function calls in condition (E0702)
orchestrator.validateConditionNoFunctionCall(node.expression(), "while");
// Issue #884: Validate condition is a boolean expression (E0701)
orchestrator.validateConditionIsBoolean(node.expression(), "while");
// ADR-113 / #1075: reject always-true literal condition (E0707)
orchestrator.validateLoopConditionNotAlwaysTrue(node.expression());
const condition = orchestrator.generateExpression(node.expression());
// Issue #250: Flush any temp vars from condition BEFORE generating body
// Otherwise they end up inside the loop body, causing "not declared" errors
const conditionTemps = orchestrator.flushPendingTempDeclarations();
const body = orchestrator.generateStatement(node.statement());
let result = `while (${condition}) ${body}`;
// Prepend condition temps before the while statement
if (conditionTemps) {
result = conditionTemps + "\n" + result;
}
return { code: result, effects };
};
/**
* Generate C code for a do-while statement (ADR-027).
*/
const generateDoWhile = (
node: DoWhileStatementContext,
_input: IGeneratorInput,
_state: IGeneratorState,
orchestrator: IOrchestrator,
): IGeneratorOutput => {
const effects: TGeneratorEffect[] = [];
// Issue #254: Validate no function calls in condition (E0702)
orchestrator.validateConditionNoFunctionCall(node.expression(), "do-while");
// Issue #884: Validate condition is a boolean expression (E0701)
orchestrator.validateConditionIsBoolean(node.expression(), "do-while");
// ADR-113 / #1075: reject always-true literal condition (E0707)
orchestrator.validateLoopConditionNotAlwaysTrue(node.expression());
const body = orchestrator.generateBlock(node.block());
const condition = orchestrator.generateExpression(node.expression());
// Issue #250: Flush any temp vars from condition
// For do-while, condition is evaluated after body, but temps must be declared before
const conditionTemps = orchestrator.flushPendingTempDeclarations();
let result = `do ${body} while (${condition});`;
if (conditionTemps) {
result = conditionTemps + "\n" + result;
}
return { code: result, effects };
};
/**
* Generate variable declaration for for loop init (no trailing semicolon).
*/
const generateForVarDecl = (
node: ForVarDeclContext,
_input: IGeneratorInput,
_state: IGeneratorState,
orchestrator: IOrchestrator,
): IGeneratorOutput => {
const effects: TGeneratorEffect[] = [];
// Issue #696: Use shared modifier builder
const modifiers = VariableModifierBuilder.buildSimple(node);
const typeName = orchestrator.generateType(node.type());
const name = node.IDENTIFIER().getText();
// ADR-016: Track local variables (allowed as bare identifiers inside scopes)
orchestrator.registerLocalVariable(name);
let result = `${modifiers.atomic}${modifiers.volatile}${typeName} ${name}`;
// ADR-036: Handle array dimensions (now returns array for multi-dim support)
const arrayDims = node.arrayDimension();
if (arrayDims.length > 0) {
result = `${typeName} ${name}${orchestrator.generateArrayDimensions(arrayDims)}`;
}
// Handle initialization
if (node.expression()) {
const value = orchestrator.generateExpression(node.expression()!);
result += ` = ${value}`;
}
return { code: result, effects };
};
/**
* Generate assignment for for loop init/update (no trailing semicolon).
*/
const generateForAssignment = (
node: ForAssignmentContext,
_input: IGeneratorInput,
_state: IGeneratorState,
orchestrator: IOrchestrator,
): IGeneratorOutput => {
const effects: TGeneratorEffect[] = [];
const target = orchestrator.generateAssignmentTarget(node.assignmentTarget());
const value = orchestrator.generateExpression(node.expression());
const operatorCtx = node.assignmentOperator();
const cnextOp = operatorCtx.getText();
const cOp = ASSIGNMENT_OPERATOR_MAP[cnextOp] || "=";
return { code: `${target} ${cOp} ${value}`, effects };
};
/**
* Generate C code for a for statement.
*
* Note: Issue #250 - temps from condition/update are hoisted before the for loop.
* This means the expression is evaluated once, not on each iteration.
* This is a known limitation; if the value changes inside the loop,
* the user should capture it in a variable explicitly.
*/
const generateFor = (
node: ForStatementContext,
input: IGeneratorInput,
state: IGeneratorState,
orchestrator: IOrchestrator,
): IGeneratorOutput => {
const effects: TGeneratorEffect[] = [];
// ADR-113 / #1075 E0707: a for-loop with no controlling expression (`for (;;)`)
// is a disguised infinite loop. C-Next has one source form for that — `forever`.
if (!node.expression()) {
throw new Error(
"Error E0707: for-loop has no controlling expression (infinite loop)\n" +
" help: write 'forever { ... }' for an intentional infinite loop",
);
}
let init = "";
const forInit = node.forInit();
if (forInit) {
if (forInit.forVarDecl()) {
const result = generateForVarDecl(
forInit.forVarDecl()!,
input,
state,
orchestrator,
);
init = result.code;
effects.push(...result.effects);
E} else if (forInit.forAssignment()) {
const result = generateForAssignment(
forInit.forAssignment()!,
input,
state,
orchestrator,
);
init = result.code;
effects.push(...result.effects);
}
}
// Issue #250: Flush temps from init before generating condition
const initTemps = orchestrator.flushPendingTempDeclarations();
// The empty-header case (`for (;;)`) already threw E0707 above, so the
// controlling expression is guaranteed present here.
const conditionExpr = node.expression()!;
// Issue #254: Validate no function calls in condition (E0702)
orchestrator.validateConditionNoFunctionCall(conditionExpr, "for");
// Issue #884: Validate condition is a boolean expression (E0701)
orchestrator.validateConditionIsBoolean(conditionExpr, "for");
// ADR-113 / #1075: reject always-true literal condition (E0707)
orchestrator.validateLoopConditionNotAlwaysTrue(conditionExpr);
const condition = orchestrator.generateExpression(conditionExpr);
// Issue #250: Flush temps from condition before generating update
const conditionTemps = orchestrator.flushPendingTempDeclarations();
let update = "";
const forUpdate = node.forUpdate();
if (forUpdate) {
const target = orchestrator.generateAssignmentTarget(
forUpdate.assignmentTarget(),
);
const value = orchestrator.generateExpression(forUpdate.expression());
const operatorCtx = forUpdate.assignmentOperator();
const cnextOp = operatorCtx.getText();
const cOp = ASSIGNMENT_OPERATOR_MAP[cnextOp] || "=";
update = `${target} ${cOp} ${value}`;
}
// Issue #250: Flush temps from update before generating body
const updateTemps = orchestrator.flushPendingTempDeclarations();
const body = orchestrator.generateStatement(node.statement());
let result = `for (${init}; ${condition}; ${update}) ${body}`;
// Prepend all temps before the for statement
const allTemps = [initTemps, conditionTemps, updateTemps]
.filter(Boolean)
.join("\n");
if (allTemps) {
result = allTemps + "\n" + result;
}
return { code: result, effects };
};
/**
* Generate C code for a forever statement (ADR-113).
*
* Lowers to the MISRA C:2012 Rule 14.3-compliant infinite-loop idiom `for (;;)`
* (the carve-out that rule explicitly permits — no controlling expression to be
* flagged as invariant). A `forever` loop may appear only in a void function
* (E0705): a value-returning function can never honor its return type if it
* loops forever.
*/
const generateForever = (
node: ForeverStatementContext,
_input: IGeneratorInput,
_state: IGeneratorState,
orchestrator: IOrchestrator,
): IGeneratorOutput => {
const effects: TGeneratorEffect[] = [];
// ADR-113 E0705: forever is void-only.
const returnType = orchestrator.getCurrentFunctionReturnType();
Iif (returnType && returnType !== "void") {
throw new Error(
"Error E0705: forever loop in non-void function\n" +
" help: a forever loop never returns a value; make the function return void, " +
"or use a while loop with an exit condition",
);
}
const body = orchestrator.generateBlock(node.block());
const comment =
"/* MISRA C:2012 Rule 14.3: infinite loop is intentional (C-Next `forever`) */";
return { code: `${comment}\nfor (;;) ${body}`, effects };
};
// Export all control flow generators
const controlFlowGenerators = {
generateReturn,
generateIf,
generateWhile,
generateDoWhile,
generateFor,
generateForever,
generateForVarDecl,
generateForAssignment,
};
export default controlFlowGenerators;
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