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35x 35x 35x 35x 31x 31x 15x 15x 15x 35x 14x 84x 84x 84x 41x 43x 43x 14x 41x 41x 41x 41x 41x 41x 1x 1x 1x 1x 1x 39x 1x 1x 1x 1x 38x 31x 7x 41x 7x 1x 6x 14x 41x 1x 1x 41x 14x 40x 39x 38x 14x 40x 40x 14x 31x 31x 31x 31x 28x 31x 14x 1x 1x 1x 1x 1x 1x 14x 6x 6x 3x 3x 3x 1x 3x 3x 6x 14x 43x 43x 43x 22x 21x 21x 11x 10x 21x 21x 17x 17x 4x 42x 14x 21x 14x 22x 1x 21x 21x 21x 21x 22x 22x 22x 22x 17x 17x 21x 21x 21x 17x 21x 16x 5x 14x 123x | /**
* Postfix Expression Generator (Issue #644)
*
* Handles postfix expressions including:
* - Member access (obj.field)
* - Array subscripts (arr[i])
* - Bit access (value[3] or value[0, 8])
* - Function calls (func())
* - Property access (.length, .capacity, .size)
*
* This generator was extracted from CodeGenerator._generatePostfixExpr
* to reduce the size and complexity of CodeGenerator.ts.
*/
import * as Parser 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 accessGenerators from "./AccessExprGenerator";
import generateFunctionCall from "./CallExprGenerator";
import memberAccessChain from "../../memberAccessChain";
import MemberAccessValidator from "../../helpers/MemberAccessValidator";
import BitmapAccessHelper from "./BitmapAccessHelper";
import NarrowingCastHelper from "../../helpers/NarrowingCastHelper";
import TypeCheckUtils from "../../../../../utils/TypeCheckUtils";
import SubscriptClassifier from "../../subscript/SubscriptClassifier";
import TYPE_WIDTH from "../../types/TYPE_WIDTH";
import C_TYPE_WIDTH from "../../types/C_TYPE_WIDTH";
import TTypeInfo from "../../types/TTypeInfo";
import CodeGenState from "../../../../state/CodeGenState";
// ========================================================================
// Tracking State
// ========================================================================
/**
* Mutable tracking state threaded through the postfix op loop.
*/
interface ITrackingState {
result: string;
isRegisterChain: boolean;
currentMemberIsArray: boolean;
currentStructType: string | undefined;
previousStructType: string | undefined;
previousMemberName: string | undefined;
resolvedIdentifier: string | undefined;
remainingArrayDims: number;
subscriptDepth: number;
isGlobalAccess: boolean;
isCppAccessChain: boolean;
}
/**
* Initialize tracking state from the primary expression.
*/
const initializeTrackingState = (
rootIdentifier: string | undefined,
result: string,
primaryTypeInfo:
| { baseType: string; arrayDimensions?: (number | string)[] }
| undefined,
input: IGeneratorInput,
state: IGeneratorState,
orchestrator: IOrchestrator,
): ITrackingState => {
const isRegisterChain = rootIdentifier
? input.symbols!.knownRegisters.has(rootIdentifier)
: false;
const primaryBaseType = rootIdentifier
? CodeGenState.getVariableTypeInfo(rootIdentifier)?.baseType
: undefined;
const currentStructType =
primaryBaseType && orchestrator.isKnownStruct(primaryBaseType)
? primaryBaseType
: undefined;
const primaryParamInfo = rootIdentifier
? state.currentParameters.get(rootIdentifier)
: undefined;
const remainingArrayDims =
primaryTypeInfo?.arrayDimensions?.length ??
(primaryParamInfo?.isArray ? 1 : 0);
let isCppAccessChain = false;
if (rootIdentifier && orchestrator.isCppScopeSymbol(rootIdentifier)) {
isCppAccessChain = true;
}
return {
result,
isRegisterChain,
currentMemberIsArray: false,
currentStructType,
previousStructType: undefined,
previousMemberName: undefined,
resolvedIdentifier: rootIdentifier,
remainingArrayDims,
subscriptDepth: 0,
isGlobalAccess: false,
isCppAccessChain,
};
};
/**
* Context for the postfix expression being processed.
* Bundles values that don't change during the postfix op loop,
* except for `effects` which accumulates side effects via push().
*/
interface IPostfixContext {
rootIdentifier: string | undefined;
isStructParam: boolean;
/** Issue #895: Force pointer semantics for callback-compatible params */
forcePointerSemantics: boolean;
input: IGeneratorInput;
state: IGeneratorState;
orchestrator: IOrchestrator;
effects: TGeneratorEffect[];
}
// ========================================================================
// Main Entry Point
// ========================================================================
/**
* Generate C code for a postfix expression.
*
* A postfix expression consists of a primary expression followed by
* zero or more postfix operations (member access, subscripts, function calls).
*
* @param ctx - The postfix expression context
* @param input - Generator input (type registry, symbols, etc.)
* @param state - Generator state (current scope, parameters, etc.)
* @param orchestrator - Orchestrator for callbacks into CodeGenerator
* @returns Generated code and effects
*/
const generatePostfixExpression = (
ctx: Parser.PostfixExpressionContext,
input: IGeneratorInput,
state: IGeneratorState,
orchestrator: IOrchestrator,
): IGeneratorOutput => {
const effects: TGeneratorEffect[] = [];
const primary = ctx.primaryExpression();
const ops = ctx.postfixOp();
// Check if this is a struct parameter - we may need to handle -> access
const rootIdentifier = primary.IDENTIFIER()?.getText();
const paramInfo = rootIdentifier
? state.currentParameters.get(rootIdentifier)
: null;
const isStructParam = paramInfo?.isStruct ?? false;
// Issue #895: Callback-compatible params need pointer semantics even in C++ mode
const forcePointerSemantics = paramInfo?.forcePointerSemantics ?? false;
// Issue #579: Check if we have subscript access on a non-array parameter
const hasSubscriptOps = ops.some((op) => op.expression().length > 0);
const isNonArrayParamWithSubscript =
paramInfo && !paramInfo.isArray && !paramInfo.isStruct && hasSubscriptOps;
let result: string;
if (isNonArrayParamWithSubscript) {
result = rootIdentifier!;
} else {
result = orchestrator.generatePrimaryExpr(primary);
}
const primaryTypeInfo = rootIdentifier
? CodeGenState.getVariableTypeInfo(rootIdentifier)
: undefined;
const tracking = initializeTrackingState(
rootIdentifier,
result,
primaryTypeInfo,
input,
state,
orchestrator,
);
const postfixCtx: IPostfixContext = {
rootIdentifier,
isStructParam,
forcePointerSemantics,
input,
state,
orchestrator,
effects,
};
for (const op of ops) {
if (op.IDENTIFIER()) {
const memberName = op.IDENTIFIER()!.getText();
handleMemberOp(memberName, tracking, postfixCtx);
} else if (op.expression().length > 0) {
const subscriptResult = generateSubscriptAccess(
{
result: tracking.result,
op,
rootIdentifier,
primaryTypeInfo,
resolvedIdentifier: tracking.resolvedIdentifier,
currentStructType: tracking.currentStructType,
currentMemberIsArray: tracking.currentMemberIsArray,
remainingArrayDims: tracking.remainingArrayDims,
subscriptDepth: tracking.subscriptDepth,
isRegisterChain: tracking.isRegisterChain,
},
input,
state,
orchestrator,
effects,
);
tracking.result = subscriptResult.result;
tracking.currentStructType = subscriptResult.currentStructType;
tracking.currentMemberIsArray =
subscriptResult.currentMemberIsArray ?? false;
tracking.remainingArrayDims =
subscriptResult.remainingArrayDims ?? tracking.remainingArrayDims;
tracking.subscriptDepth =
subscriptResult.subscriptDepth ?? tracking.subscriptDepth;
} else {
const callResult = generateFunctionCall(
tracking.result,
op.argumentList() || null,
input,
state,
orchestrator,
);
applyAccessEffects(callResult.effects, effects);
tracking.result = callResult.code;
}
}
// ADR-006: If a struct parameter is used as a whole value (no postfix ops)
// This applies to both normal struct params AND callback-promoted struct params.
// When used as a value (assignments, etc.), we need to dereference to get the struct.
// Issue #937: For function arguments expecting pointers, CallExprGenerator handles
// using the identifier directly instead of the dereferenced form.
if (isStructParam && ops.length === 0) {
return {
code: memberAccessChain.wrapStructParamValue(result, {
cppMode: orchestrator.isCppMode(),
}),
effects,
};
}
return { code: tracking.result, effects };
};
// ========================================================================
// Member Operation Handling
// ========================================================================
/**
* Handle a member access operation (the `.identifier` part of postfix).
* Mutates `tracking` in place.
*/
const handleMemberOp = (
memberName: string,
tracking: ITrackingState,
ctx: IPostfixContext,
): void => {
// ADR-016: Handle global. prefix
if (
handleGlobalPrefix(
memberName,
tracking,
ctx.input,
ctx.state,
ctx.orchestrator,
)
) {
return;
}
// Issue #212: Check if 'length' is a scope variable before treating as property
if (
handleThisScopeLength(
memberName,
tracking,
ctx.input,
ctx.state,
ctx.orchestrator,
)
) {
return;
}
// Handle property access (.length, .capacity, .size)
if (
tryPropertyAccess(
memberName,
tracking,
ctx.rootIdentifier,
ctx.input,
ctx.state,
ctx.orchestrator,
ctx.effects,
)
) {
return;
}
// Handle bitmap field access, scope member access, enum member access, etc.
const memberResult = generateMemberAccess(
{
result: tracking.result,
memberName,
rootIdentifier: ctx.rootIdentifier,
isStructParam: ctx.isStructParam,
forcePointerSemantics: ctx.forcePointerSemantics,
isGlobalAccess: tracking.isGlobalAccess,
isCppAccessChain: tracking.isCppAccessChain,
currentStructType: tracking.currentStructType,
resolvedIdentifier: tracking.resolvedIdentifier,
previousStructType: tracking.previousStructType,
previousMemberName: tracking.previousMemberName,
isRegisterChain: tracking.isRegisterChain,
},
ctx.input,
ctx.state,
ctx.orchestrator,
ctx.effects,
);
tracking.result = memberResult.result;
tracking.resolvedIdentifier =
memberResult.resolvedIdentifier ?? tracking.resolvedIdentifier;
tracking.currentStructType = memberResult.currentStructType;
tracking.currentMemberIsArray =
memberResult.currentMemberIsArray ?? tracking.currentMemberIsArray;
tracking.isRegisterChain =
memberResult.isRegisterChain ?? tracking.isRegisterChain;
tracking.isCppAccessChain =
memberResult.isCppAccessChain ?? tracking.isCppAccessChain;
tracking.previousStructType = memberResult.previousStructType;
tracking.previousMemberName = memberResult.previousMemberName;
};
/**
* Handle `global.X` prefix. Returns true if handled (caller should skip).
*/
const handleGlobalPrefix = (
memberName: string,
tracking: ITrackingState,
input: IGeneratorInput,
state: IGeneratorState,
orchestrator: IOrchestrator,
): boolean => {
if (tracking.result !== "__GLOBAL_PREFIX__") {
return false;
}
tracking.result = memberName;
tracking.resolvedIdentifier = memberName;
tracking.isGlobalAccess = true;
// ADR-057: Check if global variable would be shadowed by a local
if (state.localVariables.has(memberName)) {
throw new Error(
`Error: Cannot use 'global.${memberName}' when local variable '${memberName}' shadows it. ` +
`Rename the local variable to avoid shadowing.`,
);
}
if (orchestrator.isCppScopeSymbol(memberName)) {
tracking.isCppAccessChain = true;
}
if (input.symbols!.knownRegisters.has(memberName)) {
tracking.isRegisterChain = true;
}
// Issue #612: Set currentStructType for global struct variables
const globalTypeInfo = CodeGenState.getVariableTypeInfo(memberName);
if (globalTypeInfo && orchestrator.isKnownStruct(globalTypeInfo.baseType)) {
tracking.currentStructType = globalTypeInfo.baseType;
}
return true;
};
/**
* Handle `this.length` when length is a scope member variable.
* Returns true if handled (caller should skip).
*/
const handleThisScopeLength = (
memberName: string,
tracking: ITrackingState,
_input: IGeneratorInput,
state: IGeneratorState,
orchestrator: IOrchestrator,
): boolean => {
if (tracking.result !== "__THIS_SCOPE__" || memberName !== "length") {
return false;
}
if (!state.currentScope) {
throw new Error("Error: 'this' can only be used inside a scope");
}
const members = state.scopeMembers.get(state.currentScope);
Iif (!members?.has("length")) {
return false;
}
tracking.result = `${state.currentScope}_${memberName}`;
tracking.resolvedIdentifier = tracking.result;
const resolvedTypeInfo = CodeGenState.getVariableTypeInfo(tracking.result);
if (
resolvedTypeInfo &&
orchestrator.isKnownStruct(resolvedTypeInfo.baseType)
) {
tracking.currentStructType = resolvedTypeInfo.baseType;
}
return true;
};
/**
* Resolve the TTypeInfo for .capacity/.size on the current expression.
*
* Tries in order:
* 1. resolvedIdentifier (tracks the resolved identifier through member chains)
* 2. rootIdentifier (the leftmost identifier)
* 3. Struct field lookup via previousStructType/previousMemberName
* (handles alice.name.capacity where resolvedIdentifier is undefined)
*/
const resolveStringTypeInfo = (
tracking: ITrackingState,
rootIdentifier: string | undefined,
input: IGeneratorInput,
orchestrator: IOrchestrator,
): TTypeInfo | undefined => {
const identifier = tracking.resolvedIdentifier ?? rootIdentifier;
const typeInfo = identifier
? CodeGenState.getVariableTypeInfo(identifier)
: undefined;
if (typeInfo?.isString) {
return typeInfo;
}
// Struct member path: look up the field type to build a synthetic TTypeInfo
Eif (tracking.previousStructType && tracking.previousMemberName) {
const fieldInfo = orchestrator.getStructFieldInfo(
tracking.previousStructType,
tracking.previousMemberName,
);
Eif (fieldInfo && TypeCheckUtils.isString(fieldInfo.type)) {
const capacityMatch = /^string<(\d+)>$/.exec(fieldInfo.type);
const capacity = capacityMatch ? Number(capacityMatch[1]) : undefined;
return {
baseType: "char",
bitWidth: 8,
isArray: false,
isConst: false,
isString: true,
stringCapacity: capacity,
} as TTypeInfo;
}
}
return typeInfo;
};
/**
* Create context object for explicit length property generators.
*/
const createExplicitLengthContext = (
tracking: ITrackingState,
rootIdentifier: string | undefined,
): IExplicitLengthContext => ({
result: tracking.result,
rootIdentifier,
resolvedIdentifier: tracking.resolvedIdentifier,
previousStructType: tracking.previousStructType,
previousMemberName: tracking.previousMemberName,
subscriptDepth: tracking.subscriptDepth,
});
/**
* Apply property result to tracking state.
*/
const applyPropertyResult = (
tracking: ITrackingState,
result: string,
): void => {
tracking.result = result;
tracking.previousStructType = undefined;
tracking.previousMemberName = undefined;
};
/**
* Try handling explicit length property (ADR-058).
* Returns true if handled.
*/
const tryExplicitLengthProperty = (
memberName: string,
tracking: ITrackingState,
rootIdentifier: string | undefined,
input: IGeneratorInput,
state: IGeneratorState,
orchestrator: IOrchestrator,
effects: TGeneratorEffect[],
): boolean => {
const ctx = createExplicitLengthContext(tracking, rootIdentifier);
let result: string | null = null;
switch (memberName) {
case "bit_length":
result = generateBitLengthProperty(ctx, input, state, orchestrator);
break;
case "byte_length":
result = generateByteLengthProperty(ctx, input, state, orchestrator);
break;
case "element_count":
result = generateElementCountProperty(ctx, input, state, orchestrator);
break;
case "char_count":
result = generateCharCountProperty(
ctx,
input,
state,
orchestrator,
effects,
);
break;
}
Eif (result !== null) {
applyPropertyResult(tracking, result);
return true;
}
return false;
};
/**
* Try handling property access (.capacity, .size, .bit_length, .byte_length, .element_count, .char_count).
* Returns true if handled.
*
* Note: .length was removed in favor of explicit properties (ADR-058).
*/
const tryPropertyAccess = (
memberName: string,
tracking: ITrackingState,
rootIdentifier: string | undefined,
input: IGeneratorInput,
state: IGeneratorState,
orchestrator: IOrchestrator,
effects: TGeneratorEffect[],
): boolean => {
// ADR-058: .length is deprecated - use explicit properties instead
if (memberName === "length") {
throw new Error(
`Error: '.length' on '${tracking.result}' is deprecated. Use explicit properties: ` +
`.bit_length (bit width), .byte_length (byte size), ` +
`.element_count (array size), or .char_count (string length)`,
);
}
// ADR-058: Explicit length properties
const explicitProps = new Set([
"bit_length",
"byte_length",
"element_count",
"char_count",
]);
if (explicitProps.has(memberName)) {
return tryExplicitLengthProperty(
memberName,
tracking,
rootIdentifier,
input,
state,
orchestrator,
effects,
);
}
if (memberName === "capacity") {
const typeInfo = resolveStringTypeInfo(
tracking,
rootIdentifier,
input,
orchestrator,
);
const capResult = accessGenerators.generateCapacityProperty(typeInfo);
applyAccessEffects(capResult.effects, effects);
tracking.result = capResult.code;
return true;
}
if (memberName === "size") {
const typeInfo = resolveStringTypeInfo(
tracking,
rootIdentifier,
input,
orchestrator,
);
const sizeResult = accessGenerators.generateSizeProperty(typeInfo);
applyAccessEffects(sizeResult.effects, effects);
tracking.result = sizeResult.code;
return true;
}
return false;
};
// ========================================================================
// ADR-058: Explicit Length Properties
// ========================================================================
/**
* Context for explicit length property generation.
*/
interface IExplicitLengthContext {
result: string;
rootIdentifier: string | undefined;
resolvedIdentifier: string | undefined;
previousStructType: string | undefined;
previousMemberName: string | undefined;
subscriptDepth: number;
}
/**
* Get the numeric bit width for a type (internal helper for ADR-058).
* Returns 0 if type is unknown.
*
* Note: This differs from getTypeBitWidth() which returns a string and is
* used for the legacy .length property. This function returns a number for
* use in calculations (e.g., array total bits = elements * element width).
*/
const getNumericBitWidth = (
typeName: string,
input: IGeneratorInput,
): number => {
let bitWidth = TYPE_WIDTH[typeName] ?? C_TYPE_WIDTH[typeName] ?? 0;
Iif (bitWidth === 0 && input.symbolTable) {
const enumWidth = input.symbolTable.getEnumBitWidth(typeName);
if (enumWidth) bitWidth = enumWidth;
}
// Check if it's a known enum (default to 32 bits per ADR-017)
if (bitWidth === 0 && input.symbols?.knownEnums?.has(typeName)) {
bitWidth = 32;
}
// Check bitmap types
if (bitWidth === 0 && input.symbols?.bitmapBitWidth) {
const bitmapWidth = input.symbols.bitmapBitWidth.get(typeName);
Iif (bitmapWidth) bitWidth = bitmapWidth;
}
return bitWidth;
};
/**
* Generate .bit_length property access (ADR-058).
* Returns the bit width of any type.
*/
const generateBitLengthProperty = (
ctx: IExplicitLengthContext,
input: IGeneratorInput,
state: IGeneratorState,
orchestrator: IOrchestrator,
): string | null => {
// Special case: main function's args.bit_length -> not supported
if (state.mainArgsName && ctx.rootIdentifier === state.mainArgsName) {
throw new Error(
`Error: .bit_length is not supported on 'args' parameter. Use .element_count for argc.`,
);
}
// Check struct member access
if (ctx.previousStructType && ctx.previousMemberName) {
const fieldInfo = orchestrator.getStructFieldInfo(
ctx.previousStructType,
ctx.previousMemberName,
);
Eif (fieldInfo) {
return generateStructFieldBitLength(fieldInfo, ctx.subscriptDepth, input);
}
}
// Get type info for the resolved identifier
const typeInfo = ctx.resolvedIdentifier
? CodeGenState.getVariableTypeInfo(ctx.resolvedIdentifier)
: undefined;
if (!typeInfo) {
throw new Error(
`Error: Cannot determine .bit_length for '${ctx.result}' - type not found in registry.`,
);
}
return generateTypeInfoBitLength(typeInfo, ctx.subscriptDepth, input);
};
/**
* Calculate product of remaining array dimensions from subscript depth.
* Returns null if a dynamic dimension (C macro) is encountered.
*/
const calculateRemainingDimensionsProduct = (
dimensions: (number | string)[],
subscriptDepth: number,
): { product: number } | { dynamicDim: string } => {
let product = 1;
for (let i = subscriptDepth; i < dimensions.length; i++) {
const dim = dimensions[i];
if (typeof dim !== "number") {
return { dynamicDim: dim };
}
product *= dim;
}
return { product };
};
/**
* Generate bit length for string type from type name.
*/
const generateStringBitLengthFromTypeName = (
typeName: string,
): string | null => {
if (!typeName.startsWith("string<")) {
return null;
}
const capacityMatch = /^string<(\d+)>$/.exec(typeName);
Eif (capacityMatch) {
const capacity = Number(capacityMatch[1]);
return String((capacity + 1) * 8);
}
return null;
};
/**
* Generate .bit_length for a struct field.
*/
const generateStructFieldBitLength = (
fieldInfo: { type: string; dimensions?: (number | string)[] },
subscriptDepth: number,
input: IGeneratorInput,
): string => {
const memberType = fieldInfo.type;
const dimensions = fieldInfo.dimensions;
// String field: bit_length = (capacity + 1) * 8
const stringBitLength = generateStringBitLengthFromTypeName(memberType);
if (stringBitLength !== null) {
return stringBitLength;
}
// Array field: total bits = product of dimensions * element bit width
Iif (dimensions && dimensions.length > subscriptDepth) {
const elementBitWidth = getNumericBitWidth(memberType, input);
if (elementBitWidth > 0) {
const dimResult = calculateRemainingDimensionsProduct(
dimensions,
subscriptDepth,
);
if ("dynamicDim" in dimResult) {
return `/* .bit_length: dynamic dimension ${dimResult.dynamicDim} */0`;
}
return String(dimResult.product * elementBitWidth);
}
}
// Scalar or fully subscripted: return element bit width
const bitWidth = getNumericBitWidth(memberType, input);
Eif (bitWidth > 0) {
return String(bitWidth);
}
throw new Error(
`Error: Cannot determine .bit_length for unsupported type '${memberType}'.`,
);
};
/**
* Generate bit length for a scalar (non-array) type.
*/
const generateScalarBitLength = (
typeInfo: {
isEnum?: boolean;
baseType: string;
bitWidth?: number;
},
input: IGeneratorInput,
): string => {
// Enum type: always 32 bits
if (typeInfo.isEnum) {
return "32";
}
Eif (typeInfo.bitWidth) {
return String(typeInfo.bitWidth);
}
// Try lookup by base type
const bitWidth = getNumericBitWidth(typeInfo.baseType, input);
if (bitWidth > 0) {
return String(bitWidth);
}
throw new Error(
`Error: Cannot determine .bit_length for unsupported type '${typeInfo.baseType}'.`,
);
};
/**
* Get element bit width for array type.
*/
const getArrayElementBitWidth = (
typeInfo: {
isEnum?: boolean;
baseType: string;
bitWidth?: number;
},
input: IGeneratorInput,
): number => {
let elementBitWidth = typeInfo.bitWidth || 0;
if (elementBitWidth === 0) {
elementBitWidth = getNumericBitWidth(typeInfo.baseType, input);
}
Iif (elementBitWidth === 0 && typeInfo.isEnum) {
elementBitWidth = 32;
}
return elementBitWidth;
};
/**
* Generate bit length for an array type.
*/
const generateArrayBitLength = (
typeInfo: {
isEnum?: boolean;
arrayDimensions?: (number | string)[];
baseType: string;
bitWidth?: number;
},
subscriptDepth: number,
input: IGeneratorInput,
): string => {
const dims = typeInfo.arrayDimensions;
if (!dims || dims.length === 0) {
throw new Error(
`Error: Cannot determine .bit_length for array with unknown dimensions.`,
);
}
const elementBitWidth = getArrayElementBitWidth(typeInfo, input);
if (elementBitWidth === 0) {
throw new Error(
`Error: Cannot determine .bit_length for array with unsupported element type '${typeInfo.baseType}'.`,
);
}
const dimResult = calculateRemainingDimensionsProduct(dims, subscriptDepth);
if ("dynamicDim" in dimResult) {
return `/* .bit_length: dynamic dimension ${dimResult.dynamicDim} */0`;
}
return String(dimResult.product * elementBitWidth);
};
/**
* Generate .bit_length from type info.
*/
const generateTypeInfoBitLength = (
typeInfo: {
isString?: boolean;
isArray?: boolean;
isEnum?: boolean;
arrayDimensions?: (number | string)[];
baseType: string;
bitWidth?: number;
isBitmap?: boolean;
bitmapTypeName?: string;
stringCapacity?: number;
},
subscriptDepth: number,
input: IGeneratorInput,
): string => {
// String type: bit_length = (capacity + 1) * 8 (buffer size in bits)
if (typeInfo.isString) {
if (typeInfo.stringCapacity !== undefined) {
return String((typeInfo.stringCapacity + 1) * 8);
}
throw new Error(
`Error: Cannot determine .bit_length for string with unknown capacity.`,
);
}
// Non-array scalar: return bit width
if (!typeInfo.isArray) {
return generateScalarBitLength(typeInfo, input);
}
// Array: calculate total bits
return generateArrayBitLength(typeInfo, subscriptDepth, input);
};
/**
* Generate .byte_length property access (ADR-058).
* Returns the byte size of any type (bit_length / 8).
*/
const generateByteLengthProperty = (
ctx: IExplicitLengthContext,
input: IGeneratorInput,
state: IGeneratorState,
orchestrator: IOrchestrator,
): string | null => {
// Special case: main function's args
if (state.mainArgsName && ctx.rootIdentifier === state.mainArgsName) {
throw new Error(
`Error: .byte_length is not supported on 'args' parameter. Use .element_count for argc.`,
);
}
// Check struct member access
if (ctx.previousStructType && ctx.previousMemberName) {
const fieldInfo = orchestrator.getStructFieldInfo(
ctx.previousStructType,
ctx.previousMemberName,
);
Eif (fieldInfo) {
const bitLength = generateStructFieldBitLength(
fieldInfo,
ctx.subscriptDepth,
input,
);
// Parse and convert to bytes
const bitValue = Number.parseInt(bitLength, 10);
Eif (!Number.isNaN(bitValue)) {
return String(bitValue / 8);
}
return bitLength.replace(".bit_length", ".byte_length");
}
}
// Get type info for the resolved identifier
const typeInfo = ctx.resolvedIdentifier
? CodeGenState.getVariableTypeInfo(ctx.resolvedIdentifier)
: undefined;
if (!typeInfo) {
throw new Error(
`Error: Cannot determine .byte_length for '${ctx.result}' - type not found in registry.`,
);
}
const bitLength = generateTypeInfoBitLength(
typeInfo,
ctx.subscriptDepth,
input,
);
const bitValue = Number.parseInt(bitLength, 10);
Eif (!Number.isNaN(bitValue)) {
return String(bitValue / 8);
}
return bitLength.replace(".bit_length", ".byte_length");
};
/**
* Get dimension value at subscript depth as string.
*/
const getDimensionAtDepth = (
dimensions: (number | string)[],
subscriptDepth: number,
): string => {
const dim = dimensions[subscriptDepth];
return typeof dim === "number" ? String(dim) : dim;
};
/**
* Generate element_count for struct field.
*/
const generateStructFieldElementCount = (
ctx: IExplicitLengthContext,
orchestrator: IOrchestrator,
): string | null => {
if (!ctx.previousStructType || !ctx.previousMemberName) {
return null;
}
const fieldInfo = orchestrator.getStructFieldInfo(
ctx.previousStructType,
ctx.previousMemberName,
);
if (
fieldInfo?.dimensions &&
fieldInfo.dimensions.length > ctx.subscriptDepth
) {
return getDimensionAtDepth(fieldInfo.dimensions, ctx.subscriptDepth);
}
// Non-array field - element_count not applicable
throw new Error(
`Error: .element_count is only available on arrays, not on '${fieldInfo?.type || ctx.previousMemberName}'.`,
);
};
/**
* Generate element_count from type info.
*/
const generateTypeInfoElementCount = (
ctx: IExplicitLengthContext,
_input: IGeneratorInput,
): string => {
const typeInfo = ctx.resolvedIdentifier
? CodeGenState.getVariableTypeInfo(ctx.resolvedIdentifier)
: undefined;
if (!typeInfo) {
throw new Error(
`Error: Cannot determine .element_count for '${ctx.result}' - type not found in registry.`,
);
}
if (!typeInfo.isArray) {
throw new Error(
`Error: .element_count is only available on arrays, not on '${typeInfo.baseType}'.`,
);
}
const dims = typeInfo.arrayDimensions;
if (!dims || dims.length === 0) {
throw new Error(
`Error: Cannot determine .element_count for array with unknown dimensions.`,
);
}
Eif (ctx.subscriptDepth < dims.length) {
return getDimensionAtDepth(dims, ctx.subscriptDepth);
}
throw new Error(
`Error: .element_count is not available on array elements. Array is fully subscripted.`,
);
};
/**
* Generate .element_count property access (ADR-058).
* Returns element count for arrays or argc for args.
*/
const generateElementCountProperty = (
ctx: IExplicitLengthContext,
input: IGeneratorInput,
state: IGeneratorState,
orchestrator: IOrchestrator,
): string | null => {
// Special case: main function's args.element_count -> argc
if (state.mainArgsName && ctx.rootIdentifier === state.mainArgsName) {
return "argc";
}
// Check struct member access for array fields
const structResult = generateStructFieldElementCount(ctx, orchestrator);
if (structResult !== null) {
return structResult;
}
Iif (ctx.previousStructType) {
// generateStructFieldElementCount threw or returned null but struct context existed
return null;
}
// Get type info for variable
return generateTypeInfoElementCount(ctx, input);
};
/**
* Generate .char_count property access (ADR-058).
* Returns strlen() for strings.
*/
const generateCharCountProperty = (
ctx: IExplicitLengthContext,
input: IGeneratorInput,
state: IGeneratorState,
orchestrator: IOrchestrator,
effects: TGeneratorEffect[],
): string | null => {
// Special case: main function's args
if (state.mainArgsName && ctx.rootIdentifier === state.mainArgsName) {
throw new Error(
`Error: .char_count is only available on strings, not on 'args'. Use .element_count for argc.`,
);
}
// Check struct member access for string fields
if (ctx.previousStructType && ctx.previousMemberName) {
const fieldInfo = orchestrator.getStructFieldInfo(
ctx.previousStructType,
ctx.previousMemberName,
);
if (fieldInfo?.type.startsWith("string<")) {
effects.push({ type: "include", header: "string" });
return `strlen(${ctx.result})`;
}
// Non-string field
throw new Error(
`Error: .char_count is only available on strings, not on '${fieldInfo?.type || ctx.previousMemberName}'.`,
);
}
// Get type info
const typeInfo = ctx.resolvedIdentifier
? CodeGenState.getVariableTypeInfo(ctx.resolvedIdentifier)
: undefined;
if (!typeInfo) {
throw new Error(
`Error: Cannot determine .char_count for '${ctx.result}' - type not found in registry.`,
);
}
// Must be a string type
if (!typeInfo.isString) {
throw new Error(
`Error: .char_count is only available on strings, not on '${typeInfo.baseType}'.`,
);
}
effects.push({ type: "include", header: "string" });
// Check length cache first (only for simple variable access, not indexed)
if (
ctx.subscriptDepth === 0 &&
ctx.resolvedIdentifier &&
state.lengthCache?.has(ctx.resolvedIdentifier)
) {
return state.lengthCache.get(ctx.resolvedIdentifier)!;
}
// Use ctx.result which contains the full expression including any subscripts
// e.g., for arr[0].char_count, ctx.result is "arr[0]" not "arr"
return `strlen(${ctx.result})`;
};
// ========================================================================
// Member Access
// ========================================================================
/**
* Member access result.
*/
interface MemberAccessResult {
result: string;
resolvedIdentifier?: string;
currentStructType?: string;
currentMemberIsArray?: boolean;
isRegisterChain?: boolean;
isCppAccessChain?: boolean;
previousStructType?: string;
previousMemberName?: string;
}
/**
* Context for member access generation.
*/
interface IMemberAccessContext {
result: string;
memberName: string;
rootIdentifier: string | undefined;
isStructParam: boolean;
/** Issue #895: Force pointer semantics for callback-compatible params */
forcePointerSemantics: boolean;
isGlobalAccess: boolean;
isCppAccessChain: boolean;
currentStructType: string | undefined;
resolvedIdentifier: string | undefined;
previousStructType: string | undefined;
previousMemberName: string | undefined;
isRegisterChain: boolean;
}
/**
* Initialize the default member access output from context.
*/
const initializeMemberOutput = (
ctx: IMemberAccessContext,
): MemberAccessResult => ({
result: ctx.result,
resolvedIdentifier: ctx.resolvedIdentifier,
currentStructType: ctx.currentStructType,
currentMemberIsArray: false,
isRegisterChain: ctx.isRegisterChain,
isCppAccessChain: ctx.isCppAccessChain,
previousStructType: ctx.currentStructType,
previousMemberName: ctx.memberName,
});
/**
* Generate member access (obj.field).
* Dispatches to specialized handlers via null-coalescing chain.
*/
const generateMemberAccess = (
ctx: IMemberAccessContext,
input: IGeneratorInput,
state: IGeneratorState,
orchestrator: IOrchestrator,
effects: TGeneratorEffect[],
): MemberAccessResult => {
// Check for enum shadowing before dispatch - catches case where identifier
// was resolved to a scope member that shadows a global enum
MemberAccessValidator.validateGlobalEntityAccess(
ctx.result,
ctx.memberName,
"enum",
state.currentScope,
ctx.isGlobalAccess,
{
rootIdentifier: ctx.rootIdentifier,
knownEnums: input.symbols!.knownEnums,
},
);
return (
tryBitmapFieldAccess(ctx, input, effects) ??
tryScopeMemberAccess(ctx, input, state, orchestrator) ??
tryKnownScopeAccess(ctx, input, state, orchestrator) ??
tryEnumMemberAccess(ctx, input, state, orchestrator) ??
tryRegisterMemberAccess(ctx, input, state) ??
tryStructParamAccess(ctx, orchestrator) ??
tryRegisterBitmapAccess(ctx, input, effects) ??
tryStructBitmapAccess(ctx, input, effects) ??
generateDefaultAccess(ctx, orchestrator)
);
};
// ========================================================================
// Member Access Handlers
// ========================================================================
/**
* Check for primary bitmap type field access (e.g., status.Running).
*/
const tryBitmapFieldAccess = (
ctx: IMemberAccessContext,
input: IGeneratorInput,
effects: TGeneratorEffect[],
): MemberAccessResult | null => {
if (!ctx.rootIdentifier) {
return null;
}
const typeInfo = CodeGenState.getVariableTypeInfo(ctx.rootIdentifier);
if (!typeInfo?.isBitmap || !typeInfo.bitmapTypeName) {
return null;
}
const output = initializeMemberOutput(ctx);
const bitmapResult = BitmapAccessHelper.generate(
ctx.result,
ctx.memberName,
typeInfo.bitmapTypeName,
input.symbols!.bitmapFields,
`type '${typeInfo.bitmapTypeName}'`,
);
applyAccessEffects(bitmapResult.effects, effects);
output.result = bitmapResult.code;
return output;
};
/**
* Check for scope member access (this.member).
*/
const tryScopeMemberAccess = (
ctx: IMemberAccessContext,
input: IGeneratorInput,
state: IGeneratorState,
orchestrator: IOrchestrator,
): MemberAccessResult | null => {
if (ctx.result !== "__THIS_SCOPE__") {
return null;
}
if (!state.currentScope) {
throw new Error("Error: 'this' can only be used inside a scope");
}
const output = initializeMemberOutput(ctx);
const fullName = `${state.currentScope}_${ctx.memberName}`;
const constValue = input.symbols!.scopePrivateConstValues.get(fullName);
if (constValue === undefined) {
output.result = fullName;
output.resolvedIdentifier = fullName;
if (!input.symbols!.knownEnums.has(fullName)) {
const resolvedTypeInfo = CodeGenState.getVariableTypeInfo(fullName);
if (
resolvedTypeInfo &&
orchestrator.isKnownStruct(resolvedTypeInfo.baseType)
) {
output.currentStructType = resolvedTypeInfo.baseType;
}
}
} else {
output.result = constValue;
output.resolvedIdentifier = fullName;
}
return output;
};
/**
* Check for known scope access (e.g., LED.on).
*/
const tryKnownScopeAccess = (
ctx: IMemberAccessContext,
input: IGeneratorInput,
state: IGeneratorState,
orchestrator: IOrchestrator,
): MemberAccessResult | null => {
if (!orchestrator.isKnownScope(ctx.result)) {
return null;
}
if (!ctx.isGlobalAccess) {
MemberAccessValidator.validateNotSelfScopeReference(
ctx.result,
ctx.memberName,
state.currentScope,
);
}
orchestrator.validateCrossScopeVisibility(
ctx.result,
ctx.memberName,
ctx.isGlobalAccess,
);
const output = initializeMemberOutput(ctx);
output.result = `${ctx.result}${orchestrator.getScopeSeparator(ctx.isCppAccessChain)}${ctx.memberName}`;
output.resolvedIdentifier = output.result;
const resolvedTypeInfo = CodeGenState.getVariableTypeInfo(output.result);
Iif (
resolvedTypeInfo &&
orchestrator.isKnownStruct(resolvedTypeInfo.baseType)
) {
output.currentStructType = resolvedTypeInfo.baseType;
}
return output;
};
/**
* Check for enum member access (e.g., Color.Red).
*/
const tryEnumMemberAccess = (
ctx: IMemberAccessContext,
input: IGeneratorInput,
state: IGeneratorState,
orchestrator: IOrchestrator,
): MemberAccessResult | null => {
if (!input.symbols!.knownEnums.has(ctx.result)) {
return null;
}
// Shadowing check already done in generateMemberAccess; this catches
// direct conflicts where ctx.result is the enum name (no resolution happened)
MemberAccessValidator.validateGlobalEntityAccess(
ctx.result,
ctx.memberName,
"enum",
state.currentScope,
ctx.isGlobalAccess,
{ scopeMembers: state.scopeMembers },
);
const output = initializeMemberOutput(ctx);
output.result = `${ctx.result}${orchestrator.getScopeSeparator(ctx.isCppAccessChain)}${ctx.memberName}`;
return output;
};
/**
* Check for register member access (e.g., GPIO.PIN0).
*/
const tryRegisterMemberAccess = (
ctx: IMemberAccessContext,
input: IGeneratorInput,
state: IGeneratorState,
): MemberAccessResult | null => {
if (!input.symbols!.knownRegisters.has(ctx.result)) {
return null;
}
MemberAccessValidator.validateGlobalEntityAccess(
ctx.result,
ctx.memberName,
"register",
state.currentScope,
ctx.isGlobalAccess,
{ scopeMembers: state.scopeMembers },
);
MemberAccessValidator.validateRegisterReadAccess(
`${ctx.result}_${ctx.memberName}`,
ctx.memberName,
`${ctx.result}.${ctx.memberName}`,
input.symbols!.registerMemberAccess,
false,
);
const output = initializeMemberOutput(ctx);
output.result = `${ctx.result}_${ctx.memberName}`;
output.isRegisterChain = true;
return output;
};
/**
* Check for struct parameter access (e.g., point->x or point.x in C++).
*/
const tryStructParamAccess = (
ctx: IMemberAccessContext,
orchestrator: IOrchestrator,
): MemberAccessResult | null => {
if (!ctx.isStructParam || ctx.result !== ctx.rootIdentifier) {
return null;
}
// Issue #895: Force pointer semantics for callback-compatible params
// even in C++ mode (use -> instead of .)
const structParamSep = ctx.forcePointerSemantics
? "->"
: memberAccessChain.getStructParamSeparator({
cppMode: orchestrator.isCppMode(),
});
const output = initializeMemberOutput(ctx);
output.result = `${ctx.result}${structParamSep}${ctx.memberName}`;
output.previousStructType = ctx.currentStructType;
output.previousMemberName = ctx.memberName;
if (ctx.currentStructType) {
const memberTypeInfo = orchestrator.getMemberTypeInfo(
ctx.currentStructType,
ctx.memberName,
);
if (memberTypeInfo) {
output.currentMemberIsArray = memberTypeInfo.isArray;
output.currentStructType = memberTypeInfo.baseType;
}
}
return output;
};
/**
* Check for register member with bitmap type (e.g., MOTOR_CTRL.Running).
*/
const tryRegisterBitmapAccess = (
ctx: IMemberAccessContext,
input: IGeneratorInput,
effects: TGeneratorEffect[],
): MemberAccessResult | null => {
if (!input.symbols!.registerMemberTypes.has(ctx.result)) {
return null;
}
const bitmapType = input.symbols!.registerMemberTypes.get(ctx.result)!;
const output = initializeMemberOutput(ctx);
const bitmapResult = BitmapAccessHelper.generate(
ctx.result,
ctx.memberName,
bitmapType,
input.symbols!.bitmapFields,
`register member '${ctx.result}' (bitmap type '${bitmapType}')`,
);
applyAccessEffects(bitmapResult.effects, effects);
output.result = bitmapResult.code;
return output;
};
/**
* Check for struct member with bitmap type (e.g., device.flags.Active).
*/
const tryStructBitmapAccess = (
ctx: IMemberAccessContext,
input: IGeneratorInput,
effects: TGeneratorEffect[],
): MemberAccessResult | null => {
if (
!ctx.currentStructType ||
!input.symbols!.bitmapFields.has(ctx.currentStructType)
) {
return null;
}
const output = initializeMemberOutput(ctx);
const bitmapResult = BitmapAccessHelper.generate(
ctx.result,
ctx.memberName,
ctx.currentStructType,
input.symbols!.bitmapFields,
`struct member '${ctx.result}' (bitmap type '${ctx.currentStructType}')`,
);
applyAccessEffects(bitmapResult.effects, effects);
output.result = bitmapResult.code;
return output;
};
/**
* Default member access (dot or :: separator with struct type tracking).
*/
const generateDefaultAccess = (
ctx: IMemberAccessContext,
orchestrator: IOrchestrator,
): MemberAccessResult => {
const separator = ctx.isCppAccessChain ? "::" : ".";
const output = initializeMemberOutput(ctx);
output.result = `${ctx.result}${separator}${ctx.memberName}`;
output.previousStructType = ctx.currentStructType;
output.previousMemberName = ctx.memberName;
if (ctx.currentStructType) {
const memberTypeInfo = orchestrator.getMemberTypeInfo(
ctx.currentStructType,
ctx.memberName,
);
if (memberTypeInfo) {
output.currentMemberIsArray = memberTypeInfo.isArray;
output.currentStructType = memberTypeInfo.baseType;
output.resolvedIdentifier = undefined;
}
}
return output;
};
// ========================================================================
// Subscript Access
// ========================================================================
/**
* Subscript access result.
*/
interface SubscriptAccessResult {
result: string;
currentStructType?: string;
currentMemberIsArray?: boolean;
remainingArrayDims?: number;
subscriptDepth?: number;
}
/**
* Context for subscript access generation.
*/
interface ISubscriptAccessContext {
result: string;
op: Parser.PostfixOpContext;
rootIdentifier: string | undefined;
primaryTypeInfo:
| { baseType: string; arrayDimensions?: (number | string)[] }
| undefined;
resolvedIdentifier: string | undefined;
currentStructType: string | undefined;
currentMemberIsArray: boolean;
remainingArrayDims: number;
subscriptDepth: number;
isRegisterChain: boolean;
}
/**
* Generate subscript access (arr[i] or value[bit]).
* Dispatches to single-index or dual-index handler.
*/
const generateSubscriptAccess = (
ctx: ISubscriptAccessContext,
input: IGeneratorInput,
state: IGeneratorState,
orchestrator: IOrchestrator,
effects: TGeneratorEffect[],
): SubscriptAccessResult => {
const exprs = ctx.op.expression();
const output: SubscriptAccessResult = {
result: ctx.result,
currentStructType: ctx.currentStructType,
currentMemberIsArray: false,
remainingArrayDims: ctx.remainingArrayDims,
subscriptDepth: ctx.subscriptDepth,
};
if (exprs.length === 1) {
return handleSingleSubscript(ctx, exprs[0], input, orchestrator, output);
E} else if (exprs.length === 2) {
return handleBitRangeSubscript(
ctx,
exprs,
input,
state,
orchestrator,
effects,
output,
);
}
return output;
};
/**
* Handle single-index subscript (arr[i] or value[bit]).
*/
const handleSingleSubscript = (
ctx: ISubscriptAccessContext,
expr: Parser.ExpressionContext,
input: IGeneratorInput,
orchestrator: IOrchestrator,
output: SubscriptAccessResult,
): SubscriptAccessResult => {
// Set expectedType to size_t (unsigned) for array indices per MISRA 7.2
// This ensures index literals get U suffix regardless of element type
const index = CodeGenState.withExpectedType("size_t", () =>
orchestrator.generateExpression(expr),
);
// Check if result is a register member with bitmap type (throws)
validateNotBitmapMember(ctx, input);
const isRegisterAccess = checkRegisterAccess(ctx, input);
const identifierTypeInfo = getIdentifierTypeInfo(ctx, input);
// Register access: bit extraction
if (isRegisterAccess) {
// Skip shift when index is 0 (either "0" or "0U" with MISRA suffix)
let expr =
index === "0" || index === "0U"
? `((${ctx.result}) & 1)`
: `((${ctx.result} >> ${index}) & 1)`;
// MISRA 10.3: Add narrowing cast if expected type is narrower than int
const targetType = CodeGenState.expectedType;
Iif (targetType) {
expr = NarrowingCastHelper.wrap(expr, "int", targetType);
}
output.result = expr;
return output;
}
// Member array access
if (ctx.currentMemberIsArray) {
output.result = `${ctx.result}[${index}]`;
output.currentMemberIsArray = false;
output.subscriptDepth = ctx.subscriptDepth + 1;
return output;
}
// Multi-dimensional array access
if (ctx.remainingArrayDims > 0) {
return handleRemainingArrayDims(ctx, index, output);
}
// Primitive int member: bit access
const isPrimitiveIntMember =
ctx.currentStructType && TypeCheckUtils.isInteger(ctx.currentStructType);
Iif (isPrimitiveIntMember) {
// Skip shift when index is 0 (either "0" or "0U" with MISRA suffix)
let expr =
index === "0" || index === "0U"
? `((${ctx.result}) & 1)`
: `((${ctx.result} >> ${index}) & 1)`;
// MISRA 10.3: Add narrowing cast if expected type is narrower than int
const targetType = CodeGenState.expectedType;
if (targetType) {
expr = NarrowingCastHelper.wrap(expr, "int", targetType);
}
output.result = expr;
output.currentStructType = undefined;
return output;
}
// Primary array access
if (identifierTypeInfo?.isArray) {
return handlePrimaryArraySubscript(
ctx,
index,
identifierTypeInfo,
orchestrator,
output,
);
}
// Default: classify subscript type
return handleDefaultSubscript(ctx, index, identifierTypeInfo, output);
};
/**
* Validate that result is not a bitmap member (which requires named access).
*/
const validateNotBitmapMember = (
ctx: ISubscriptAccessContext,
input: IGeneratorInput,
): void => {
if (!input.symbols!.registerMemberTypes.has(ctx.result)) return;
const bitmapType = input.symbols!.registerMemberTypes.get(ctx.result)!;
const line = ctx.op.start?.line ?? 0;
throw new Error(
`Error at line ${line}: Cannot use bracket indexing on bitmap type '${bitmapType}'. ` +
`Use named field access instead (e.g., ${ctx.result.split("_").at(-1)}.FIELD_NAME).`,
);
};
/**
* Check if this is a register access (bit extraction).
*/
const checkRegisterAccess = (
ctx: ISubscriptAccessContext,
input: IGeneratorInput,
): boolean => {
if (ctx.isRegisterChain) return true;
if (!ctx.rootIdentifier) return false;
return input.symbols!.knownRegisters.has(ctx.rootIdentifier);
};
/**
* Get type info for the identifier being subscripted.
*/
const getIdentifierTypeInfo = (
ctx: ISubscriptAccessContext,
_input: IGeneratorInput,
): TTypeInfo | undefined => {
const identifierToCheck = ctx.resolvedIdentifier || ctx.rootIdentifier;
return identifierToCheck
? CodeGenState.getVariableTypeInfo(identifierToCheck)
: undefined;
};
/**
* Handle subscript on array with remaining dimensions.
*/
const handleRemainingArrayDims = (
ctx: ISubscriptAccessContext,
index: string,
output: SubscriptAccessResult,
): SubscriptAccessResult => {
output.result = `${ctx.result}[${index}]`;
output.remainingArrayDims = ctx.remainingArrayDims - 1;
output.subscriptDepth = ctx.subscriptDepth + 1;
if (output.remainingArrayDims === 0 && ctx.primaryTypeInfo) {
output.currentStructType = ctx.primaryTypeInfo.baseType;
}
return output;
};
/**
* Handle subscript on a primary array.
*/
const handlePrimaryArraySubscript = (
ctx: ISubscriptAccessContext,
index: string,
typeInfo: TTypeInfo,
orchestrator: IOrchestrator,
output: SubscriptAccessResult,
): SubscriptAccessResult => {
output.result = `${ctx.result}[${index}]`;
output.subscriptDepth = ctx.subscriptDepth + 1;
// Update struct type if element is a known struct
Eif (!ctx.currentStructType) {
const elementType = typeInfo.baseType;
Iif (orchestrator.isKnownStruct(elementType)) {
output.currentStructType = elementType;
}
}
return output;
};
/**
* Handle default subscript (classify and apply).
*/
const handleDefaultSubscript = (
ctx: ISubscriptAccessContext,
index: string,
typeInfo: TTypeInfo | undefined,
output: SubscriptAccessResult,
): SubscriptAccessResult => {
const subscriptKind = SubscriptClassifier.classify({
typeInfo: typeInfo ?? null,
subscriptCount: 1,
isRegisterAccess: false,
});
if (subscriptKind === "bit_single") {
// Skip shift when index is 0 (either "0" or "0U" with MISRA suffix)
let expr =
index === "0" || index === "0U"
? `((${ctx.result}) & 1)`
: `((${ctx.result} >> ${index}) & 1)`;
// MISRA 10.3: Add narrowing cast if expected type is narrower than int
const targetType = CodeGenState.expectedType;
if (targetType) {
expr = NarrowingCastHelper.wrap(expr, "int", targetType);
}
output.result = expr;
} else {
output.result = `${ctx.result}[${index}]`;
}
return output;
};
/**
* Handle dual-index subscript (value[start, width] — bit range).
*/
const handleBitRangeSubscript = (
ctx: ISubscriptAccessContext,
exprs: Parser.ExpressionContext[],
input: IGeneratorInput,
state: IGeneratorState,
orchestrator: IOrchestrator,
effects: TGeneratorEffect[],
output: SubscriptAccessResult,
): SubscriptAccessResult => {
// Set expectedType to size_t (unsigned) for bit indices per MISRA 7.2
// Bit positions are inherently unsigned values
const [start, width] = CodeGenState.withExpectedType("size_t", () => [
orchestrator.generateExpression(exprs[0]),
orchestrator.generateExpression(exprs[1]),
]);
const isFloatType =
ctx.primaryTypeInfo?.baseType === "f32" ||
ctx.primaryTypeInfo?.baseType === "f64";
if (isFloatType && ctx.rootIdentifier) {
output.result = handleFloatBitRange(
{
result: ctx.result,
rootIdentifier: ctx.rootIdentifier,
baseType: ctx.primaryTypeInfo!.baseType,
start,
width,
},
state,
orchestrator,
effects,
);
} else {
const mask = orchestrator.generateBitMask(width);
// Skip shift when start is 0 (either "0" or "0U" with MISRA suffix)
let expr: string;
if (start === "0" || start === "0U") {
expr = `((${ctx.result}) & ${mask})`;
} else {
expr = `((${ctx.result} >> ${start}) & ${mask})`;
}
// MISRA 10.3: Add narrowing cast if expected type is known
// Bit operations promote to int, so wrap with cast when assigning to narrower types
const targetType = CodeGenState.expectedType;
if (targetType && ctx.primaryTypeInfo?.baseType) {
const promotedSourceType = NarrowingCastHelper.getPromotedType(
ctx.primaryTypeInfo.baseType,
);
output.result = NarrowingCastHelper.wrap(
expr,
promotedSourceType,
targetType,
);
} else {
output.result = expr;
}
}
return output;
};
/**
* Context for float bit range access.
*/
interface IFloatBitRangeContext {
result: string;
rootIdentifier: string;
baseType: string;
start: string;
width: string;
}
/**
* Get the C float type name for a C-Next float type.
*/
const getFloatTypeName = (baseType: string): string => {
return baseType === "f64" ? "double" : "float";
};
/**
* Handle float bit range access with union-based type punning.
* Uses union { float f; uint32_t u; } for MISRA C:2012 Rule 21.15 compliance.
*/
const handleFloatBitRange = (
ctx: IFloatBitRangeContext,
state: IGeneratorState,
orchestrator: IOrchestrator,
effects: TGeneratorEffect[],
): string => {
if (!state.inFunctionBody) {
throw new Error(
`Float bit indexing reads (${ctx.rootIdentifier}[${ctx.start}, ${ctx.width}]) cannot be used at global scope.`,
);
}
effects.push({ type: "include", header: "float_static_assert" });
const isF64 = ctx.baseType === "f64";
const floatType = getFloatTypeName(ctx.baseType);
const intType = isF64 ? "uint64_t" : "uint32_t";
const shadowName = `__bits_${ctx.rootIdentifier}`;
const mask = orchestrator.generateBitMask(ctx.width, isF64);
const needsDeclaration = !orchestrator.hasFloatBitShadow(shadowName);
if (needsDeclaration) {
orchestrator.registerFloatBitShadow(shadowName);
// Emit union declaration: union { float f; uint32_t u; } __bits_name;
orchestrator.addPendingTempDeclaration(
`union { ${floatType} f; ${intType} u; } ${shadowName};`,
);
}
const shadowIsCurrent = orchestrator.isFloatShadowCurrent(shadowName);
orchestrator.markFloatShadowCurrent(shadowName);
// If shadow is not current, emit assignment: __bits_name.f = floatVar;
if (!shadowIsCurrent) {
orchestrator.addPendingTempDeclaration(`${shadowName}.f = ${ctx.result};`);
}
// Return just the bit read expression using union member .u
// Skip shift when start is 0 (either "0" or "0U" with MISRA suffix)
if (ctx.start === "0" || ctx.start === "0U") {
return `(${shadowName}.u & ${mask})`;
}
return `((${shadowName}.u >> ${ctx.start}) & ${mask})`;
};
// ========================================================================
// Utilities
// ========================================================================
/**
* Apply effects from access generators.
*/
const applyAccessEffects = (
sourceEffects: readonly TGeneratorEffect[],
targetEffects: TGeneratorEffect[],
): void => {
for (const effect of sourceEffects) {
targetEffects.push(effect);
}
};
export default generatePostfixExpression;
|