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* Register bit assignment handlers (ADR-109).
*
* Handles assignments to register bits:
* - REGISTER_BIT: GPIO7.DR_SET[LED_BIT] <- true
* - REGISTER_BIT_RANGE: GPIO7.DR_SET[0, 8] <- value
* - REGISTER_MEMORY_MAPPED: Width-appropriate MMIO access
* - SCOPED_REGISTER_BIT: this.GPIO7.DR_SET[bit] <- true
* - SCOPED_REGISTER_BIT_RANGE: this.GPIO7.ICR1[6, 2] <- value
*/
import AssignmentKind from "../AssignmentKind";
import IAssignmentContext from "../IAssignmentContext";
import IHandlerDeps from "./IHandlerDeps";
import BitUtils from "../../../../../utils/BitUtils";
import TypeCheckUtils from "../../../../../utils/TypeCheckUtils";
import TAssignmentHandler from "./TAssignmentHandler";
import RegisterUtils from "./RegisterUtils";
import AssignmentHandlerUtils from "./AssignmentHandlerUtils";
/**
* Try to generate MMIO-optimized memory access for byte-aligned writes.
* Returns null if optimization not applicable.
*/
function tryGenerateMMIO(
fullName: string,
regName: string,
startExpr: ReturnType<IHandlerDeps["tryEvaluateConstant"]>,
widthExpr: ReturnType<IHandlerDeps["tryEvaluateConstant"]>,
value: string,
deps: IHandlerDeps,
): string | null {
if (
startExpr === undefined ||
widthExpr === undefined ||
startExpr % 8 !== 0 ||
!TypeCheckUtils.isStandardWidth(widthExpr)
) {
return null;
}
const baseAddr = deps.symbols.registerBaseAddresses.get(regName);
const memberOffset = deps.symbols.registerMemberOffsets.get(fullName);
Iif (baseAddr === undefined || memberOffset === undefined) {
return null;
}
const byteOffset = startExpr / 8;
const accessType = `uint${widthExpr}_t`;
const totalOffset =
byteOffset === 0 ? memberOffset : `${memberOffset} + ${byteOffset}`;
return `*((volatile ${accessType}*)(${baseAddr} + ${totalOffset})) = (${value});`;
}
/**
* Handle register single bit: GPIO7.DR_SET[LED_BIT] <- true
*/
function handleRegisterBit(
ctx: IAssignmentContext,
deps: IHandlerDeps,
): string {
// Issue #707: Use shared validation utility
AssignmentHandlerUtils.validateNoCompoundForBitAccess(
ctx.isCompound,
ctx.cnextOp,
);
const { fullName } =
AssignmentHandlerUtils.buildRegisterNameWithScopeDetection(
ctx.identifiers,
deps.isKnownScope,
);
const accessMod = deps.symbols.registerMemberAccess.get(fullName);
const isWriteOnly = RegisterUtils.isWriteOnlyRegister(accessMod);
const bitIndex = deps.generateExpression(ctx.subscripts[0]);
if (isWriteOnly) {
AssignmentHandlerUtils.validateWriteOnlyValue(
ctx.generatedValue,
fullName,
bitIndex,
true,
);
return `${fullName} = (1 << ${bitIndex});`;
}
return `${fullName} = (${fullName} & ~(1 << ${bitIndex})) | (${BitUtils.boolToInt(ctx.generatedValue)} << ${bitIndex});`;
}
/**
* Handle register bit range: GPIO7.DR_SET[0, 8] <- value
*/
function handleRegisterBitRange(
ctx: IAssignmentContext,
deps: IHandlerDeps,
): string {
// Issue #707: Use shared validation utility
AssignmentHandlerUtils.validateNoCompoundForBitAccess(
ctx.isCompound,
ctx.cnextOp,
);
const { fullName, regName } =
AssignmentHandlerUtils.buildRegisterNameWithScopeDetection(
ctx.identifiers,
deps.isKnownScope,
);
const accessMod = deps.symbols.registerMemberAccess.get(fullName);
const isWriteOnly = RegisterUtils.isWriteOnlyRegister(accessMod);
const start = deps.generateExpression(ctx.subscripts[0]);
const width = deps.generateExpression(ctx.subscripts[1]);
const mask = BitUtils.generateMask(width);
if (isWriteOnly) {
AssignmentHandlerUtils.validateWriteOnlyValue(
ctx.generatedValue,
fullName,
`${start}, ${width}`,
false,
);
// Try MMIO optimization
const startConst = deps.tryEvaluateConstant(ctx.subscripts[0]);
const widthConst = deps.tryEvaluateConstant(ctx.subscripts[1]);
const mmio = tryGenerateMMIO(
fullName,
regName,
startConst,
widthConst,
ctx.generatedValue,
deps,
);
if (mmio) {
return mmio;
}
// Fallback: write shifted value
return RegisterUtils.generateWriteOnlyBitRange(
fullName,
ctx.generatedValue,
mask,
start,
);
}
// Read-write: read-modify-write
return RegisterUtils.generateRmwBitRange(
fullName,
ctx.generatedValue,
mask,
start,
);
}
/**
* Handle scoped register single bit: this.GPIO7.DR_SET[bit] <- true
*/
function handleScopedRegisterBit(
ctx: IAssignmentContext,
deps: IHandlerDeps,
): string {
// Issue #707: Use shared validation utilities
AssignmentHandlerUtils.validateScopeContext(deps.currentScope);
AssignmentHandlerUtils.validateNoCompoundForBitAccess(
ctx.isCompound,
ctx.cnextOp,
);
// Build scoped name: Scope_Register_Member
const regName = AssignmentHandlerUtils.buildScopedRegisterName(
deps.currentScope!,
ctx.identifiers,
);
const accessMod = deps.symbols.registerMemberAccess.get(regName);
const isWriteOnly = RegisterUtils.isWriteOnlyRegister(accessMod);
const bitIndex = deps.generateExpression(ctx.subscripts[0]);
if (isWriteOnly) {
AssignmentHandlerUtils.validateWriteOnlyValue(
ctx.generatedValue,
regName,
bitIndex,
true,
);
return `${regName} = (1 << ${bitIndex});`;
}
return `${regName} = (${regName} & ~(1 << ${bitIndex})) | (${BitUtils.boolToInt(ctx.generatedValue)} << ${bitIndex});`;
}
/**
* Handle scoped register bit range: this.GPIO7.ICR1[6, 2] <- value
*/
function handleScopedRegisterBitRange(
ctx: IAssignmentContext,
deps: IHandlerDeps,
): string {
// Issue #707: Use shared validation utilities
AssignmentHandlerUtils.validateScopeContext(deps.currentScope);
AssignmentHandlerUtils.validateNoCompoundForBitAccess(
ctx.isCompound,
ctx.cnextOp,
);
const scopeName = deps.currentScope!;
const parts = ctx.identifiers;
const regName = AssignmentHandlerUtils.buildScopedRegisterName(
scopeName,
parts,
);
const scopedRegName = `${scopeName}_${parts[0]}`;
const accessMod = deps.symbols.registerMemberAccess.get(regName);
const isWriteOnly = RegisterUtils.isWriteOnlyRegister(accessMod);
const start = deps.generateExpression(ctx.subscripts[0]);
const width = deps.generateExpression(ctx.subscripts[1]);
const mask = `((1U << ${width}) - 1)`;
if (isWriteOnly) {
AssignmentHandlerUtils.validateWriteOnlyValue(
ctx.generatedValue,
regName,
`${start}, ${width}`,
false,
);
// Try MMIO optimization
const startConst = deps.tryEvaluateConstant(ctx.subscripts[0]);
const widthConst = deps.tryEvaluateConstant(ctx.subscripts[1]);
if (
startConst !== undefined &&
widthConst !== undefined &&
startConst % 8 === 0 &&
TypeCheckUtils.isStandardWidth(widthConst)
) {
const baseAddr = deps.symbols.registerBaseAddresses.get(scopedRegName);
const memberOffset = deps.symbols.registerMemberOffsets.get(regName);
Eif (baseAddr !== undefined && memberOffset !== undefined) {
const byteOffset = startConst / 8;
const accessType = `uint${widthConst}_t`;
const totalOffset =
byteOffset === 0 ? memberOffset : `${memberOffset} + ${byteOffset}`;
return `*((volatile ${accessType}*)(${baseAddr} + ${totalOffset})) = (${ctx.generatedValue});`;
}
}
return RegisterUtils.generateWriteOnlyBitRange(
regName,
ctx.generatedValue,
mask,
start,
);
}
return RegisterUtils.generateRmwBitRange(
regName,
ctx.generatedValue,
mask,
start,
);
}
/**
* All register handlers for registration.
*/
const registerHandlers: ReadonlyArray<[AssignmentKind, TAssignmentHandler]> = [
[AssignmentKind.REGISTER_BIT, handleRegisterBit],
[AssignmentKind.REGISTER_BIT_RANGE, handleRegisterBitRange],
[AssignmentKind.SCOPED_REGISTER_BIT, handleScopedRegisterBit],
[AssignmentKind.SCOPED_REGISTER_BIT_RANGE, handleScopedRegisterBitRange],
];
export default registerHandlers;
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