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* Assignment classifier for dispatch-based code generation (ADR-109).
*
* Analyzes an assignment context and determines which AssignmentKind it is.
* The classification order matches the original generateAssignment() method's
* if-else chain to ensure identical behavior.
*
* Migrated to use CodeGenState instead of constructor DI.
*/
import AssignmentKind from "./AssignmentKind";
import IAssignmentContext from "./IAssignmentContext";
import CodeGenState from "../../../state/CodeGenState";
import SubscriptClassifier from "../subscript/SubscriptClassifier";
import TTypeInfo from "../types/TTypeInfo";
import TypeCheckUtils from "../../../../utils/TypeCheckUtils";
import QualifiedNameGenerator from "../utils/QualifiedNameGenerator";
/**
* Classifies assignment statements by analyzing their structure.
*
* Classification priority (higher = checked first):
* 1. Bitmap field assignments (memberAccess patterns)
* 2. Register bit/bitmap assignments
* 3. Global/this prefix patterns
* 4. Array/bit access patterns
* 5. Atomic/overflow special cases
* 6. String assignments
* 7. Simple fallback
*/
class AssignmentClassifier {
/**
* Check if typeInfo represents a simple string type (not a 2D+ string array).
*/
private static isSimpleStringType(typeInfo: TTypeInfo | undefined): boolean {
return (
typeInfo?.isString === true &&
typeInfo.stringCapacity !== undefined &&
(!typeInfo.arrayDimensions || typeInfo.arrayDimensions.length <= 1)
);
}
/**
* Extract struct name and field name from a 2-identifier context.
*/
private static getStructFieldNames(
ctx: IAssignmentContext,
): { structName: string; fieldName: string } | null {
if (ctx.identifiers.length !== 2) {
return null;
}
return { structName: ctx.identifiers[0], fieldName: ctx.identifiers[1] };
}
/**
* Classify an assignment context into an AssignmentKind.
*/
static classify(ctx: IAssignmentContext): AssignmentKind {
// === Priority 1: Bitmap field assignments ===
const bitmapKind = AssignmentClassifier.classifyBitmapField(ctx);
if (bitmapKind !== null) {
return bitmapKind;
}
// === Priority 2: Member access with subscripts (arrays, register bits) ===
const memberSubscriptKind =
AssignmentClassifier.classifyMemberWithSubscript(ctx);
if (memberSubscriptKind !== null) {
return memberSubscriptKind;
}
// === Priority 3: Global/this prefix patterns ===
const prefixKind = AssignmentClassifier.classifyPrefixPattern(ctx);
if (prefixKind !== null) {
return prefixKind;
}
// === Priority 4: Simple array/bit access ===
const arrayBitKind = AssignmentClassifier.classifyArrayOrBitAccess(ctx);
if (arrayBitKind !== null) {
return arrayBitKind;
}
// === Priority 5: Atomic/overflow compound assignments ===
const specialKind = AssignmentClassifier.classifySpecialCompound(ctx);
if (specialKind !== null) {
return specialKind;
}
// === Priority 6: String assignments ===
const stringKind = AssignmentClassifier.classifyStringAssignment(ctx);
if (stringKind !== null) {
return stringKind;
}
// === Priority 7: Member chain fallback ===
// Any member access with subscripts that didn't match a more specific pattern
if (ctx.hasMemberAccess && ctx.hasArrayAccess) {
return AssignmentKind.MEMBER_CHAIN;
}
// === Fallback: Simple assignment ===
return AssignmentKind.SIMPLE;
}
/**
* Classify bitmap field assignments.
* Patterns: var.field, struct.bitmapMember.field, REG.MEMBER.field, Scope.REG.MEMBER.field
*/
private static classifyBitmapField(
ctx: IAssignmentContext,
): AssignmentKind | null {
// Must have member access without subscripts
if (!ctx.hasMemberAccess || ctx.hasArrayAccess) {
return null;
}
const ids = ctx.identifiers;
Iif (ctx.subscripts.length !== 0) {
return null;
}
if (ids.length === 2) {
return AssignmentClassifier.classifySimpleBitmapField(ids[0], ids[1]);
}
if (ids.length === 3) {
return AssignmentClassifier.classifyThreeIdBitmapField(
ids[0],
ids[1],
ids[2],
);
}
if (ids.length === 4) {
return AssignmentClassifier.classifyScopedRegisterBitmapField(ids);
}
return null;
}
/**
* Classify 2-id bitmap field: var.field
*/
private static classifySimpleBitmapField(
varName: string,
fieldName: string,
): AssignmentKind | null {
const typeInfo = CodeGenState.getVariableTypeInfo(varName);
if (!typeInfo?.isBitmap || !typeInfo.bitmapTypeName) {
return null;
}
const width = AssignmentClassifier.lookupBitmapFieldWidth(
typeInfo.bitmapTypeName,
fieldName,
);
Iif (width === null) {
return null;
}
return width === 1
? AssignmentKind.BITMAP_FIELD_SINGLE_BIT
: AssignmentKind.BITMAP_FIELD_MULTI_BIT;
}
/**
* Classify 3-id bitmap field: REG.MEMBER.field or struct.bitmapMember.field
*/
private static classifyThreeIdBitmapField(
firstName: string,
secondName: string,
fieldName: string,
): AssignmentKind | null {
// Check if register member bitmap field: REG.MEMBER.field
if (CodeGenState.symbols!.knownRegisters.has(firstName)) {
const bitmapType = AssignmentClassifier.lookupRegisterMemberBitmapType(
firstName,
secondName,
);
Eif (bitmapType) {
const width = AssignmentClassifier.lookupBitmapFieldWidth(
bitmapType,
fieldName,
);
Eif (width !== null) {
return AssignmentKind.REGISTER_MEMBER_BITMAP_FIELD;
}
}
return null;
}
// Check if struct member bitmap field: struct.bitmapMember.field
const structTypeInfo = CodeGenState.getVariableTypeInfo(firstName);
if (
!structTypeInfo ||
!CodeGenState.isKnownStruct(structTypeInfo.baseType)
) {
return null;
}
const memberInfo = CodeGenState.getMemberTypeInfo(
structTypeInfo.baseType,
secondName,
);
Iif (!memberInfo) {
return null;
}
const width = AssignmentClassifier.lookupBitmapFieldWidth(
memberInfo.baseType,
fieldName,
);
if (width !== null) {
return AssignmentKind.STRUCT_MEMBER_BITMAP_FIELD;
}
return null;
}
/**
* Classify 4-id scoped register bitmap field: Scope.REG.MEMBER.field
*/
private static classifyScopedRegisterBitmapField(
ids: readonly string[],
): AssignmentKind | null {
const scopeName = ids[0];
if (!CodeGenState.isKnownScope(scopeName)) {
return null;
}
const fullRegName = QualifiedNameGenerator.forMember(scopeName, ids[1]);
Iif (!CodeGenState.symbols!.knownRegisters.has(fullRegName)) {
return null;
}
const bitmapType = AssignmentClassifier.lookupRegisterMemberBitmapType(
fullRegName,
ids[2],
);
Iif (!bitmapType) {
return null;
}
const width = AssignmentClassifier.lookupBitmapFieldWidth(
bitmapType,
ids[3],
);
Eif (width !== null) {
return AssignmentKind.SCOPED_REGISTER_MEMBER_BITMAP_FIELD;
}
return null;
}
/**
* Classify member access with subscripts.
* Patterns: arr[i][j], struct.arr[i], REG.MEMBER[bit], matrix[i][j][bit]
*/
private static classifyMemberWithSubscript(
ctx: IAssignmentContext,
): AssignmentKind | null {
// Need subscripts through memberAccess pattern
if (!ctx.hasMemberAccess || ctx.subscripts.length === 0) {
return null;
}
// Skip this.* and global.* patterns - they're handled by classifyPrefixPattern
Iif (ctx.hasThis || ctx.hasGlobal) {
return null;
}
const ids = ctx.identifiers;
const firstId = ids[0];
const typeInfo = CodeGenState.getVariableTypeInfo(firstId);
// Check for bit range through struct chain: devices[0].control[0, 4]
// Detected by last subscript having 2 expressions (start, width)
Iif (ctx.lastSubscriptExprCount === 2) {
return AssignmentKind.STRUCT_CHAIN_BIT_RANGE;
}
// Multi-dimensional array element: arr[i][j] (1 identifier, multiple subscripts)
if (ids.length === 1) {
return AssignmentClassifier.classifyMultiDimArrayAccess(
typeInfo,
ctx.subscripts.length,
);
}
// 2+ identifiers with subscripts: register bit or bitmap array
Eif (ids.length >= 2) {
const registerKind = AssignmentClassifier.classifyRegisterBitAccess(
ids,
ctx.subscripts.length,
);
if (registerKind !== null) {
return registerKind;
}
return AssignmentClassifier.classifyBitmapArrayField(
ids[1],
typeInfo,
ctx.subscripts.length,
);
}
return null;
}
/**
* Classify multi-dimensional array access: arr[i][j] or arr[i][j][bit]
*/
private static classifyMultiDimArrayAccess(
typeInfo: TTypeInfo | undefined,
subscriptCount: number,
): AssignmentKind | null {
Iif (!typeInfo?.isArray || !typeInfo.arrayDimensions) {
return null;
}
const numDims = typeInfo.arrayDimensions.length;
// Check for bit indexing on array element
if (
subscriptCount === numDims + 1 &&
TypeCheckUtils.isInteger(typeInfo.baseType)
) {
return AssignmentKind.ARRAY_ELEMENT_BIT;
}
return AssignmentKind.MULTI_DIM_ARRAY_ELEMENT;
}
/**
* Classify register bit access: REG.MEMBER[bit] or Scope.REG.MEMBER[bit]
*/
private static classifyRegisterBitAccess(
ids: readonly string[],
subscriptCount: number,
): AssignmentKind | null {
const firstId = ids[0];
// Check for scoped register: Scope.REG.MEMBER[bit]
if (CodeGenState.isKnownScope(firstId) && ids.length >= 3) {
const scopedRegName = `${firstId}_${ids[1]}`;
Eif (CodeGenState.symbols!.knownRegisters.has(scopedRegName)) {
return subscriptCount === 2
? AssignmentKind.REGISTER_BIT_RANGE
: AssignmentKind.REGISTER_BIT;
}
}
// Check for non-scoped register: REG.MEMBER[bit]
if (CodeGenState.symbols!.knownRegisters.has(firstId)) {
return subscriptCount === 2
? AssignmentKind.REGISTER_BIT_RANGE
: AssignmentKind.REGISTER_BIT;
}
return null;
}
/**
* Classify bitmap array element field: bitmapArr[i].field
*/
private static classifyBitmapArrayField(
secondId: string,
typeInfo: TTypeInfo | undefined,
subscriptCount: number,
): AssignmentKind | null {
Iif (subscriptCount !== 1) {
return null;
}
if (!typeInfo?.isBitmap || !typeInfo.isArray || !typeInfo.bitmapTypeName) {
return null;
}
const width = AssignmentClassifier.lookupBitmapFieldWidth(
typeInfo.bitmapTypeName,
secondId,
);
Eif (width !== null) {
return AssignmentKind.BITMAP_ARRAY_ELEMENT_FIELD;
}
return null;
}
/**
* Classify global.* and this.* prefix patterns.
*/
private static classifyPrefixPattern(
ctx: IAssignmentContext,
): AssignmentKind | null {
if (!ctx.hasGlobal && !ctx.hasThis) {
return null;
}
if (ctx.hasGlobal && ctx.postfixOpsCount > 0) {
return AssignmentClassifier.classifyGlobalPrefix(ctx);
}
if (ctx.hasThis && ctx.postfixOpsCount > 0) {
return AssignmentClassifier.classifyThisPrefix(ctx);
}
return null;
}
/**
* Classify global.* patterns: global.reg[bit], global.arr[i], global.member
*/
private static classifyGlobalPrefix(ctx: IAssignmentContext): AssignmentKind {
const firstId = ctx.identifiers[0];
if (ctx.hasArrayAccess) {
Iif (CodeGenState.symbols!.knownRegisters.has(firstId)) {
return AssignmentKind.GLOBAL_REGISTER_BIT;
}
return AssignmentKind.GLOBAL_ARRAY;
}
return AssignmentKind.GLOBAL_MEMBER;
}
/**
* Classify this.* patterns: this.reg[bit], this.member, this.REG.MEMBER.field
*/
private static classifyThisPrefix(ctx: IAssignmentContext): AssignmentKind {
Iif (!CodeGenState.currentScope) {
return AssignmentKind.THIS_MEMBER;
}
const firstId = ctx.identifiers[0];
const scopedRegName = `${CodeGenState.currentScope}_${firstId}`;
if (ctx.hasArrayAccess) {
return AssignmentClassifier.classifyThisWithArrayAccess(
ctx,
scopedRegName,
);
}
// this.REG.MEMBER.field (scoped register bitmap field)
if (
ctx.identifiers.length === 3 &&
CodeGenState.symbols!.knownRegisters.has(scopedRegName)
) {
const bitmapType = AssignmentClassifier.lookupRegisterMemberBitmapType(
scopedRegName,
ctx.identifiers[1],
);
Eif (bitmapType) {
return AssignmentKind.SCOPED_REGISTER_MEMBER_BITMAP_FIELD;
}
}
return AssignmentKind.THIS_MEMBER;
}
/**
* Classify this.reg[bit] / this.arr[i] / this.flags[3] patterns with array access.
* Issue #954: Uses SubscriptClassifier to distinguish array vs bit access.
*/
private static classifyThisWithArrayAccess(
ctx: IAssignmentContext,
scopedRegName: string,
): AssignmentKind {
// Check for scoped register first
if (CodeGenState.symbols!.knownRegisters.has(scopedRegName)) {
const hasBitRange = ctx.postfixOps.some((op) => op.COMMA() !== null);
return hasBitRange
? AssignmentKind.SCOPED_REGISTER_BIT_RANGE
: AssignmentKind.SCOPED_REGISTER_BIT;
}
// Get type info using resolved scoped name (e.g., "Sensor_value")
const typeInfo = CodeGenState.getVariableTypeInfo(scopedRegName);
// Use shared classifier to determine array vs bit access
const subscriptKind = SubscriptClassifier.classify({
typeInfo: typeInfo ?? null,
subscriptCount: ctx.lastSubscriptExprCount,
isRegisterAccess: false,
});
switch (subscriptKind) {
case "bit_single":
return AssignmentKind.THIS_BIT;
case "bit_range":
return AssignmentKind.THIS_BIT_RANGE;
default:
return AssignmentKind.THIS_ARRAY;
}
}
/**
* Classify simple array/bit access (no prefix, no member access).
* Pattern: arr[i] or flags[bit]
*
* Issue #579: Uses shared SubscriptClassifier to ensure consistent behavior
* with the expression path in CodeGenerator._generatePostfixExpr.
*/
private static classifyArrayOrBitAccess(
ctx: IAssignmentContext,
): AssignmentKind | null {
// Must have arrayAccess without memberAccess or prefix
if (ctx.hasGlobal || ctx.hasThis || ctx.hasMemberAccess) {
return null;
}
if (!ctx.hasArrayAccess || ctx.subscripts.length === 0) {
return null;
}
const name = ctx.identifiers[0];
const typeInfo = CodeGenState.getVariableTypeInfo(name) ?? null;
// Use shared classifier for array vs bit access decision
// Use lastSubscriptExprCount to distinguish [0][0] (two ops, each 1 expr)
// from [0, 5] (one op, 2 exprs)
const subscriptKind = SubscriptClassifier.classify({
typeInfo,
subscriptCount: ctx.lastSubscriptExprCount,
isRegisterAccess: false,
});
switch (subscriptKind) {
case "array_element":
// Multi-dimensional array: matrix[i][j] has multiple subscript operations
// but each with 1 expression (vs slice [0, 5] with 2 expressions in 1 op)
if (ctx.subscripts.length > 1) {
// Check if last subscript is bit access on an integer array element
// e.g., matrix[i][j][bit] where matrix is 2D integer array
const numDims = typeInfo?.arrayDimensions?.length ?? 0;
if (
ctx.subscripts.length === numDims + 1 &&
typeInfo &&
TypeCheckUtils.isInteger(typeInfo.baseType)
) {
return AssignmentKind.ARRAY_ELEMENT_BIT;
}
return AssignmentKind.MULTI_DIM_ARRAY_ELEMENT;
}
// String array element (special case for 2D string arrays)
if (
typeInfo?.isString &&
typeInfo.arrayDimensions &&
typeInfo.arrayDimensions.length > 1
) {
return AssignmentKind.STRING_ARRAY_ELEMENT;
}
return AssignmentKind.ARRAY_ELEMENT;
case "array_slice":
return AssignmentKind.ARRAY_SLICE;
case "bit_single":
return AssignmentKind.INTEGER_BIT;
case "bit_range":
return AssignmentKind.INTEGER_BIT_RANGE;
}
}
/**
* Classify atomic and overflow-clamped compound assignments.
* Handles simple identifiers, this.member, and global.member patterns.
*/
private static classifySpecialCompound(
ctx: IAssignmentContext,
): AssignmentKind | null {
if (!ctx.isCompound) {
return null;
}
// Get typeInfo based on target pattern
let typeInfo;
if (ctx.isSimpleIdentifier) {
const id = ctx.identifiers[0];
typeInfo = CodeGenState.getVariableTypeInfo(id);
} else if (ctx.isSimpleThisAccess && CodeGenState.currentScope) {
// this.member pattern: lookup using scoped name
const memberName = ctx.identifiers[0];
const scopedName = `${CodeGenState.currentScope}_${memberName}`;
typeInfo = CodeGenState.getVariableTypeInfo(scopedName);
} else if (ctx.isSimpleGlobalAccess) {
// global.member pattern: lookup using direct name
const memberName = ctx.identifiers[0];
typeInfo = CodeGenState.getVariableTypeInfo(memberName);
} else {
return null;
}
if (!typeInfo) {
return null;
}
// Atomic RMW - for global atomic variables (simple identifiers or global.member)
// Scoped atomics (this.member) use overflow behavior, not LDREX/STREX
const isGlobalAtomic =
typeInfo.isAtomic && (ctx.isSimpleIdentifier || ctx.isSimpleGlobalAccess);
if (isGlobalAtomic) {
return AssignmentKind.ATOMIC_RMW;
}
// Overflow clamp (integers only, not floats)
// Only applies to arithmetic compound ops (+= -= *=) which can overflow
// Bitwise ops (&= |= ^= <<= >>=) don't overflow, so they go to SIMPLE
const ARITHMETIC_COMPOUND_OPS = new Set(["+=", "-=", "*="]);
if (
typeInfo.overflowBehavior === "clamp" &&
TypeCheckUtils.isInteger(typeInfo.baseType) &&
ARITHMETIC_COMPOUND_OPS.has(ctx.cOp)
) {
return AssignmentKind.OVERFLOW_CLAMP;
}
return null;
}
/**
* Check if a simple identifier is a string variable.
*/
private static _classifySimpleStringVar(
ctx: IAssignmentContext,
): AssignmentKind | null {
if (!ctx.isSimpleIdentifier) return null;
const id = ctx.identifiers[0];
const typeInfo = CodeGenState.getVariableTypeInfo(id);
return AssignmentClassifier.isSimpleStringType(typeInfo)
? AssignmentKind.STRING_SIMPLE
: null;
}
/**
* Check if this.member is a string.
*/
private static _classifyThisMemberString(
ctx: IAssignmentContext,
): AssignmentKind | null {
if (!ctx.isSimpleThisAccess || !CodeGenState.currentScope) return null;
const memberName = ctx.identifiers[0];
const scopedName = `${CodeGenState.currentScope}_${memberName}`;
const typeInfo = CodeGenState.getVariableTypeInfo(scopedName);
return AssignmentClassifier.isSimpleStringType(typeInfo)
? AssignmentKind.STRING_THIS_MEMBER
: null;
}
/**
* Check if global.member is a string.
*/
private static _classifyGlobalString(
ctx: IAssignmentContext,
): AssignmentKind | null {
if (!ctx.isSimpleGlobalAccess) return null;
const id = ctx.identifiers[0];
const typeInfo = CodeGenState.getVariableTypeInfo(id);
return AssignmentClassifier.isSimpleStringType(typeInfo)
? AssignmentKind.STRING_GLOBAL
: null;
}
/**
* Resolve struct type from variable name.
* Returns the base struct type if valid, null if not a known struct.
*/
private static _resolveStructType(structName: string): string | null {
const structTypeInfo = CodeGenState.getVariableTypeInfo(structName);
if (
!structTypeInfo ||
!CodeGenState.isKnownStruct(structTypeInfo.baseType)
) {
return null;
}
return structTypeInfo.baseType;
}
/**
* Resolve struct field type from struct variable name and field name.
* Returns null if struct type can't be resolved or field doesn't exist.
*/
private static _resolveStructFieldType(structFieldNames: {
structName: string;
fieldName: string;
}): { structType: string; fieldType: string | undefined } | null {
const structType = AssignmentClassifier._resolveStructType(
structFieldNames.structName,
);
if (!structType) {
return null;
}
// Issue #831: Use SymbolTable as single source of truth for struct fields
const fieldType = CodeGenState.symbolTable?.getStructFieldType(
structType,
structFieldNames.fieldName,
);
return { structType, fieldType };
}
/**
* Check if struct.field is a string field.
*/
private static _classifyStructFieldString(
ctx: IAssignmentContext,
structFieldNames: { structName: string; fieldName: string } | null,
): AssignmentKind | null {
if (!ctx.hasMemberAccess || ctx.hasArrayAccess || !structFieldNames) {
return null;
}
const resolved =
AssignmentClassifier._resolveStructFieldType(structFieldNames);
if (!resolved) {
return null;
}
return resolved.fieldType && TypeCheckUtils.isString(resolved.fieldType)
? AssignmentKind.STRING_STRUCT_FIELD
: null;
}
/**
* Check if struct.arr[i] is a string array element.
*/
private static _classifyStructArrayElementString(
ctx: IAssignmentContext,
structFieldNames: { structName: string; fieldName: string } | null,
): AssignmentKind | null {
if (
!ctx.hasMemberAccess ||
!ctx.hasArrayAccess ||
!structFieldNames ||
ctx.subscripts.length !== 1
) {
return null;
}
const resolved =
AssignmentClassifier._resolveStructFieldType(structFieldNames);
if (!resolved) {
return null;
}
const { structType, fieldType } = resolved;
const { fieldName } = structFieldNames;
const fieldArrays = CodeGenState.symbols!.structFieldArrays.get(structType);
const dimensions =
CodeGenState.symbols!.structFieldDimensions.get(structType)?.get(
fieldName,
);
const isStringArrayField =
fieldType &&
TypeCheckUtils.isString(fieldType) &&
fieldArrays?.has(fieldName) &&
dimensions &&
dimensions.length >= 1;
return isStringArrayField
? AssignmentKind.STRING_STRUCT_ARRAY_ELEMENT
: null;
}
/**
* Classify string assignments.
*/
private static classifyStringAssignment(
ctx: IAssignmentContext,
): AssignmentKind | null {
// Simple string variable
const simpleVar = AssignmentClassifier._classifySimpleStringVar(ctx);
if (simpleVar) return simpleVar;
// this.member string
const thisMember = AssignmentClassifier._classifyThisMemberString(ctx);
Iif (thisMember) return thisMember;
// global.member string
const globalMember = AssignmentClassifier._classifyGlobalString(ctx);
Iif (globalMember) return globalMember;
// struct.field or struct.arr[i] string
const structFieldNames = AssignmentClassifier.getStructFieldNames(ctx);
const structField = AssignmentClassifier._classifyStructFieldString(
ctx,
structFieldNames,
);
if (structField) return structField;
const structArrayElement =
AssignmentClassifier._classifyStructArrayElementString(
ctx,
structFieldNames,
);
Iif (structArrayElement) return structArrayElement;
return null;
}
/**
* Look up a bitmap field's width by bitmap type name and field name.
* Returns the field width if found, or null if the bitmap/field doesn't exist.
*/
private static lookupBitmapFieldWidth(
bitmapTypeName: string,
fieldName: string,
): number | null {
const fields = CodeGenState.symbols!.bitmapFields.get(bitmapTypeName);
if (fields?.has(fieldName)) {
return fields.get(fieldName)!.width;
}
return null;
}
/**
* Look up the bitmap type for a register member (e.g., "REG_MEMBER" -> "BitmapType").
* Returns the bitmap type name if found, or null.
*/
private static lookupRegisterMemberBitmapType(
registerName: string,
memberName: string,
): string | null {
const key = `${registerName}_${memberName}`;
return CodeGenState.symbols!.registerMemberTypes.get(key) ?? null;
}
}
export default AssignmentClassifier;
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