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* 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 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";
// ========================================================================
// 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
? input.typeRegistry.get(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;
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 #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
? input.typeRegistry.get(rootIdentifier)
: undefined;
const tracking = initializeTrackingState(
rootIdentifier,
result,
primaryTypeInfo,
input,
state,
orchestrator,
);
const postfixCtx: IPostfixContext = {
rootIdentifier,
isStructParam,
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)
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,
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 = input.typeRegistry.get(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 = input.typeRegistry.get(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 ? input.typeRegistry.get(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;
};
/**
* Try handling property access (.length, .capacity, .size).
* Returns true if handled.
*/
const tryPropertyAccess = (
memberName: string,
tracking: ITrackingState,
rootIdentifier: string | undefined,
input: IGeneratorInput,
state: IGeneratorState,
orchestrator: IOrchestrator,
effects: TGeneratorEffect[],
): boolean => {
if (memberName === "length") {
const lengthResult = generateLengthProperty(
{
result: tracking.result,
rootIdentifier,
resolvedIdentifier: tracking.resolvedIdentifier,
previousStructType: tracking.previousStructType,
previousMemberName: tracking.previousMemberName,
subscriptDepth: tracking.subscriptDepth,
},
input,
state,
orchestrator,
effects,
);
Eif (lengthResult !== null) {
tracking.result = lengthResult;
tracking.previousStructType = undefined;
tracking.previousMemberName = undefined;
return true;
}
return false;
}
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;
};
// ========================================================================
// Length Property
// ========================================================================
/**
* Context for .length property generation.
*/
interface ILengthContext {
result: string;
rootIdentifier: string | undefined;
resolvedIdentifier: string | undefined;
previousStructType: string | undefined;
previousMemberName: string | undefined;
subscriptDepth: number;
}
/**
* Generate .length property access.
* Returns null if not applicable (falls through to member access).
*/
const generateLengthProperty = (
ctx: ILengthContext,
input: IGeneratorInput,
state: IGeneratorState,
orchestrator: IOrchestrator,
effects: TGeneratorEffect[],
): string | null => {
// Special case: main function's args.length -> argc
if (state.mainArgsName && ctx.rootIdentifier === state.mainArgsName) {
return "argc";
}
// Check if we're accessing a struct member (cfg.magic.length)
if (ctx.previousStructType && ctx.previousMemberName) {
const fieldInfo = orchestrator.getStructFieldInfo(
ctx.previousStructType,
ctx.previousMemberName,
);
Eif (fieldInfo) {
return generateStructFieldLength(
ctx.result,
fieldInfo,
ctx.subscriptDepth,
input,
orchestrator,
effects,
);
}
}
// Fall back to checking the current resolved identifier's type
const typeInfo = ctx.resolvedIdentifier
? input.typeRegistry.get(ctx.resolvedIdentifier)
: undefined;
if (!typeInfo) {
return `/* .length: unknown type for ${ctx.result} */0`;
}
return generateTypeInfoLength(
ctx.result,
typeInfo,
ctx.subscriptDepth,
ctx.resolvedIdentifier,
input,
state,
effects,
);
};
/**
* Generate .length for a struct field.
*/
const generateStructFieldLength = (
result: string,
fieldInfo: { type: string; dimensions?: (number | string)[] },
subscriptDepth: number,
input: IGeneratorInput,
orchestrator: IOrchestrator,
effects: TGeneratorEffect[],
): string => {
const memberType = fieldInfo.type;
const dimensions = fieldInfo.dimensions;
const isStringField = TypeCheckUtils.isString(memberType);
if (dimensions?.length && dimensions.length > 1 && isStringField) {
if (subscriptDepth === 0) {
return String(dimensions[0]);
} else E{
effects.push({ type: "include", header: "string" });
return `strlen(${result})`;
}
} else if (dimensions?.length === 1 && isStringField) {
effects.push({ type: "include", header: "string" });
return `strlen(${result})`;
} else if (
dimensions?.length &&
dimensions.length > 0 &&
subscriptDepth < dimensions.length
) {
return String(dimensions[subscriptDepth]);
I} else if (
dimensions?.length &&
dimensions.length > 0 &&
subscriptDepth >= dimensions.length
) {
return getTypeBitWidth(memberType, input);
} else {
return getTypeBitWidth(memberType, input);
}
};
/**
* Generate .length from type info.
*/
const generateTypeInfoLength = (
result: string,
typeInfo: {
isString?: boolean;
isArray?: boolean;
isEnum?: boolean;
arrayDimensions?: (number | string)[];
baseType: string;
bitWidth?: number;
isBitmap?: boolean;
bitmapTypeName?: string;
},
subscriptDepth: number,
resolvedIdentifier: string | undefined,
input: IGeneratorInput,
state: IGeneratorState,
effects: TGeneratorEffect[],
): string => {
// ADR-045: String type handling
if (typeInfo.isString) {
return generateStringLength(
result,
typeInfo,
subscriptDepth,
resolvedIdentifier,
state,
);
}
// Non-string enum - always 32 bits
if (typeInfo.isEnum && !typeInfo.isArray) {
return "32";
}
// Non-string, non-enum, non-array - use bitWidth
if (!typeInfo.isArray) {
return String(typeInfo.bitWidth || 0);
}
// Array without dimensions - unknown length
const dims = typeInfo.arrayDimensions;
Iif (!dims || dims.length === 0) {
return `/* .length unknown for ${resolvedIdentifier} */0`;
}
// Array with subscript within bounds - return that dimension
if (subscriptDepth < dims.length) {
return String(dims[subscriptDepth]);
}
// Subscript past array bounds - return element type's length
return generateElementTypeLength(result, typeInfo, input, effects);
};
/**
* Generate .length for string types.
*/
const generateStringLength = (
result: string,
typeInfo: {
arrayDimensions?: (number | string)[];
},
subscriptDepth: number,
resolvedIdentifier: string | undefined,
state: IGeneratorState,
): string => {
const dims = typeInfo.arrayDimensions;
// String array (2D): first dimension is array size, second is string capacity
if (dims && dims.length > 1) {
return subscriptDepth === 0 ? String(dims[0]) : `strlen(${result})`;
}
// Simple string: check length cache first, then use strlen
if (resolvedIdentifier && state.lengthCache?.has(resolvedIdentifier)) {
return state.lengthCache.get(resolvedIdentifier)!;
}
return resolvedIdentifier
? `strlen(${resolvedIdentifier})`
: `strlen(${result})`;
};
/**
* Generate .length for array element types (subscript past bounds).
*/
const generateElementTypeLength = (
result: string,
typeInfo: {
isEnum?: boolean;
isString?: boolean;
baseType: string;
isBitmap?: boolean;
bitmapTypeName?: string;
},
input: IGeneratorInput,
effects: TGeneratorEffect[],
): string => {
// Enum element
Iif (typeInfo.isEnum) {
return "32";
}
// String element
Iif (TypeCheckUtils.isString(typeInfo.baseType) || typeInfo.isString) {
effects.push({ type: "include", header: "string" });
return `strlen(${result})`;
}
// Numeric/bitmap element - get bit width
let elementBitWidth = TYPE_WIDTH[typeInfo.baseType] || 0;
Iif (elementBitWidth === 0 && typeInfo.isBitmap && typeInfo.bitmapTypeName) {
elementBitWidth =
input.symbols!.bitmapBitWidth.get(typeInfo.bitmapTypeName) || 0;
}
Eif (elementBitWidth > 0) {
return String(elementBitWidth);
}
return `/* .length: unsupported element type ${typeInfo.baseType} */0`;
};
/**
* Get bit width for a type.
*/
const getTypeBitWidth = (typeName: string, input: IGeneratorInput): string => {
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;
}
if (bitWidth > 0) {
return String(bitWidth);
} else E{
return `/* .length: unsupported type ${typeName} */0`;
}
};
// ========================================================================
// 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;
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 =>
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 = input.typeRegistry.get(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 = input.typeRegistry.get(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)}${ctx.memberName}`;
output.resolvedIdentifier = output.result;
const resolvedTypeInfo = input.typeRegistry.get(output.result);
Iif (
resolvedTypeInfo &&
orchestrator.isKnownStruct(resolvedTypeInfo.baseType)
) {
output.currentStructType = resolvedTypeInfo.baseType;
}
return output;
};
/**
* Check for enum member access (e.g., Color.Red).
*/
const tryEnumMemberAccess = (
ctx: IMemberAccessContext,
input: IGeneratorInput,
state: IGeneratorState,
orchestrator: IOrchestrator,
): MemberAccessResult | null => {
if (!input.symbols!.knownEnums.has(ctx.result)) {
return null;
}
MemberAccessValidator.validateGlobalEntityAccess(
ctx.result,
ctx.memberName,
"enum",
state.currentScope,
ctx.isGlobalAccess,
);
const output = initializeMemberOutput(ctx);
output.result = `${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,
);
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;
}
const structParamSep = memberAccessChain.getStructParamSeparator({
cppMode: orchestrator.isCppMode(),
});
const output = initializeMemberOutput(ctx);
output.result = `${ctx.result}${structParamSep}${ctx.memberName}`;
output.previousStructType = ctx.currentStructType;
output.previousMemberName = ctx.memberName;
if (ctx.currentStructType) {
const memberTypeInfo = orchestrator.getMemberTypeInfo(
ctx.currentStructType,
ctx.memberName,
);
Eif (memberTypeInfo) {
output.currentMemberIsArray = memberTypeInfo.isArray;
output.currentStructType = memberTypeInfo.baseType;
}
}
return output;
};
/**
* Check for register member with bitmap type (e.g., MOTOR_CTRL.Running).
*/
const tryRegisterBitmapAccess = (
ctx: IMemberAccessContext,
input: IGeneratorInput,
effects: TGeneratorEffect[],
): MemberAccessResult | null => {
if (!input.symbols!.registerMemberTypes.has(ctx.result)) {
return null;
}
const bitmapType = input.symbols!.registerMemberTypes.get(ctx.result)!;
const output = initializeMemberOutput(ctx);
const bitmapResult = BitmapAccessHelper.generate(
ctx.result,
ctx.memberName,
bitmapType,
input.symbols!.bitmapFields,
`register member '${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,
);
Eif (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 => {
const index = 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) {
output.result = `((${ctx.result} >> ${index}) & 1)`;
return output;
}
// Member array access
if (ctx.currentMemberIsArray) {
output.result = `${ctx.result}[${index}]`;
output.currentMemberIsArray = false;
output.subscriptDepth = ctx.subscriptDepth + 1;
return output;
}
// Multi-dimensional array access
if (ctx.remainingArrayDims > 0) {
return handleRemainingArrayDims(ctx, index, output);
}
// Primitive int member: bit access
const isPrimitiveIntMember =
ctx.currentStructType && TypeCheckUtils.isInteger(ctx.currentStructType);
Iif (isPrimitiveIntMember) {
output.result = `((${ctx.result} >> ${index}) & 1)`;
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., ${ctx.result.split("_").at(-1)}.FIELD_NAME).`,
);
};
/**
* Check if this is a register access (bit extraction).
*/
const checkRegisterAccess = (
ctx: ISubscriptAccessContext,
input: IGeneratorInput,
): boolean => {
if (ctx.isRegisterChain) return true;
if (!ctx.rootIdentifier) return false;
return input.symbols!.knownRegisters.has(ctx.rootIdentifier);
};
/**
* Get type info for the identifier being subscripted.
*/
const getIdentifierTypeInfo = (
ctx: ISubscriptAccessContext,
input: IGeneratorInput,
): TTypeInfo | undefined => {
const identifierToCheck = ctx.resolvedIdentifier || ctx.rootIdentifier;
return identifierToCheck
? input.typeRegistry.get(identifierToCheck)
: undefined;
};
/**
* Handle subscript on array with remaining dimensions.
*/
const handleRemainingArrayDims = (
ctx: ISubscriptAccessContext,
index: string,
output: SubscriptAccessResult,
): SubscriptAccessResult => {
output.result = `${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}[${index}]`;
output.subscriptDepth = ctx.subscriptDepth + 1;
// Update struct type if element is a known struct
Eif (!ctx.currentStructType) {
const elementType = typeInfo.baseType;
Iif (orchestrator.isKnownStruct(elementType)) {
output.currentStructType = elementType;
}
}
return output;
};
/**
* Handle default subscript (classify and apply).
*/
const handleDefaultSubscript = (
ctx: ISubscriptAccessContext,
index: string,
typeInfo: TTypeInfo | undefined,
output: SubscriptAccessResult,
): SubscriptAccessResult => {
const subscriptKind = SubscriptClassifier.classify({
typeInfo: typeInfo ?? null,
subscriptCount: 1,
isRegisterAccess: false,
});
output.result =
subscriptKind === "bit_single"
? `((${ctx.result} >> ${index}) & 1)`
: `${ctx.result}[${index}]`;
return output;
};
/**
* Handle dual-index subscript (value[start, width] — bit range).
*/
const handleBitRangeSubscript = (
ctx: ISubscriptAccessContext,
exprs: Parser.ExpressionContext[],
input: IGeneratorInput,
state: IGeneratorState,
orchestrator: IOrchestrator,
effects: TGeneratorEffect[],
output: SubscriptAccessResult,
): SubscriptAccessResult => {
const start = orchestrator.generateExpression(exprs[0]);
const width = orchestrator.generateExpression(exprs[1]);
const isFloatType =
ctx.primaryTypeInfo?.baseType === "f32" ||
ctx.primaryTypeInfo?.baseType === "f64";
if (isFloatType && ctx.rootIdentifier) {
output.result = handleFloatBitRange(
{
result: ctx.result,
rootIdentifier: ctx.rootIdentifier,
baseType: ctx.primaryTypeInfo!.baseType,
start,
width,
},
state,
orchestrator,
effects,
);
} else {
const mask = orchestrator.generateBitMask(width);
if (start === "0") {
output.result = `((${ctx.result}) & ${mask})`;
} else {
output.result = `((${ctx.result} >> ${start}) & ${mask})`;
}
}
return output;
};
/**
* Context for float bit range access.
*/
interface IFloatBitRangeContext {
result: string;
rootIdentifier: string;
baseType: string;
start: string;
width: string;
}
/**
* Handle float bit range access with memcpy shadow variable.
*/
const handleFloatBitRange = (
ctx: IFloatBitRangeContext,
state: IGeneratorState,
orchestrator: IOrchestrator,
effects: TGeneratorEffect[],
): string => {
if (!state.inFunctionBody) {
throw new Error(
`Float bit indexing reads (${ctx.rootIdentifier}[${ctx.start}, ${ctx.width}]) cannot be used at global scope.`,
);
}
effects.push(
{ type: "include", header: "string" },
{ type: "include", header: "float_static_assert" },
);
const isF64 = ctx.baseType === "f64";
const shadowType = isF64 ? "uint64_t" : "uint32_t";
const shadowName = `__bits_${ctx.rootIdentifier}`;
const mask = orchestrator.generateBitMask(ctx.width, isF64);
const needsDeclaration = !orchestrator.hasFloatBitShadow(shadowName);
if (needsDeclaration) {
orchestrator.registerFloatBitShadow(shadowName);
orchestrator.addPendingTempDeclaration(`${shadowType} ${shadowName};`);
}
const shadowIsCurrent = orchestrator.isFloatShadowCurrent(shadowName);
orchestrator.markFloatShadowCurrent(shadowName);
if (shadowIsCurrent) {
if (ctx.start === "0") {
return `(${shadowName} & ${mask})`;
}
return `((${shadowName} >> ${ctx.start}) & ${mask})`;
}
if (ctx.start === "0") {
return `(memcpy(&${shadowName}, &${ctx.result}, sizeof(${ctx.result})), (${shadowName} & ${mask}))`;
}
return `(memcpy(&${shadowName}, &${ctx.result}, sizeof(${ctx.result})), ((${shadowName} >> ${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;
|