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* Base Header Generator
*
* Abstract base class for C and C++ header generators.
* Uses Template Method pattern - subclasses implement getRefSuffix() to
* determine pointer (*) vs reference (&) semantics.
*/
import IHeaderSymbol from "./types/IHeaderSymbol";
import IParameterSymbol from "../../../utils/types/IParameterSymbol";
import IHeaderOptions from "../codegen/types/IHeaderOptions";
import IHeaderTypeInput from "./generators/IHeaderTypeInput";
import typeUtils from "./generators/mapType";
import HeaderGeneratorUtils from "./HeaderGeneratorUtils";
import SymbolTable from "../../logic/symbols/SymbolTable";
// Unified parameter generation (Phase 1)
import ParameterInputAdapter from "../codegen/helpers/ParameterInputAdapter";
import ParameterSignatureBuilder from "../codegen/helpers/ParameterSignatureBuilder";
const { mapType } = typeUtils;
/** Pass-by-value parameter info from CodeGenerator */
type TPassByValueParams = ReadonlyMap<string, ReadonlySet<string>>;
/**
* Abstract base class for header file generation
*
* Generates header files (.h) from C-Next symbols. Subclasses implement
* getRefSuffix() to control pass-by-reference semantics:
* - CHeaderGenerator returns "*" for pointer-based C semantics
* - CppHeaderGenerator returns "&" for reference-based C++ semantics
*/
abstract class BaseHeaderGenerator {
/**
* Reject an external type this header cannot correctly declare.
*
* Issue #1225/#1238: `typedef struct X X;` is a guess that only holds when X
* really is an opaque struct. For a pointer typedef it declares a different
* type -- and an object of it cannot be declared at all, so a header carrying
* `extern handle_t h;` against it is not valid C or C++.
*
* The previous code filtered pointer typedefs out of the list silently, which
* swapped a contradictory declaration for a missing one. Neither is a safe
* degradation, so report it: reaching here means the type's defining header
* was not propagated into this header, and that is a transpiler defect the
* generated code should not paper over.
*
* Returns void rather than a filtered list on purpose -- an earlier version
* looked like a filter and was not one, which invites the next reader to
* preserve filtering that never existed.
*
* Normally unreachable: `Transpiler._needsDefiningHeader` sets
* `cHeadersIncluded` for exactly these types, and the caller only invokes
* this when it is false.
*/
private static assertNoPointerTypedefs(
externalTypes: string[],
symbolTable: SymbolTable | undefined,
headerName: string,
symbols: IHeaderSymbol[],
): void {
const pointerTypedef = externalTypes.find((typeName) =>
symbolTable?.isPointerTypedef(typeName),
);
if (pointerTypedef === undefined) {
return;
}
// The declaration that pulled the type in. This fires on a file the user
// did not write, so naming the C-Next declaration is the difference
// between an actionable error and a puzzle.
const origin = BaseHeaderGenerator.findDeclaringSymbol(
symbols,
pointerTypedef,
);
const declaredBy =
origin === undefined ? "" : ` It is named by '${origin.name}'.`;
const location =
origin?.sourceLine === undefined ? "" : ` Line ${origin.sourceLine}`;
throw new Error(
`E0505: '${pointerTypedef}' is a typedef of a pointer declared in another ` +
`header, and generated header '${headerName}' does not include that ` +
`header.${declaredBy} A forward declaration cannot express a pointer ` +
`typedef -- 'typedef struct ${pointerTypedef} ${pointerTypedef};' would ` +
`declare a different, incomplete type. The header that defines it must ` +
`be included.${location}`,
);
}
/** The exported symbol whose type pulled `typeName` into this header. */
private static findDeclaringSymbol(
symbols: IHeaderSymbol[],
typeName: string,
): IHeaderSymbol | undefined {
return symbols.find(
(symbol) =>
HeaderGeneratorUtils.extractBaseType(symbol.type ?? "") === typeName ||
(symbol.parameters ?? []).some(
(parameter) =>
HeaderGeneratorUtils.extractBaseType(parameter.type) === typeName,
),
);
}
/**
* Get the suffix for pass-by-reference parameters
* @returns "*" for C pointer semantics, "&" for C++ reference semantics
*/
protected abstract getRefSuffix(): string;
/**
* Generate a header file from symbols
*
* @param symbols - Array of symbols to include in header
* @param filename - Output filename (used for include guard)
* @param options - Header generation options (includes cppMode)
* @param typeInput - Optional type information for full definitions
* @param passByValueParams - Map of function names to pass-by-value parameter names
* @param allKnownEnums - All known enum names from entire compilation
* @param sourcePath - Optional source file path for header comment
*/
generate(
symbols: IHeaderSymbol[],
filename: string,
options: IHeaderOptions = {},
typeInput?: IHeaderTypeInput,
passByValueParams?: TPassByValueParams,
allKnownEnums?: ReadonlySet<string>,
sourcePath?: string,
): string {
const guard = HeaderGeneratorUtils.makeGuard(filename);
// Filter to exported symbols if requested
const exportedSymbols = options.exportedOnly
? symbols.filter((s) => s.isExported)
: symbols;
// Group symbols by kind
const groups = HeaderGeneratorUtils.groupSymbolsByKind(exportedSymbols);
// Get local type names for external type detection
const localTypes = HeaderGeneratorUtils.getLocalTypeNames(groups);
// Collect external type dependencies
// #1164: typedefs this header emits itself are local. Without this the
// header forward-declares its own callback typedef as an unknown struct.
const localTypeNamesWithCallbacks = new Set(localTypes.localTypeNames);
for (const [, cbInfo] of typeInput?.callbackTypes ?? []) {
localTypeNamesWithCallbacks.add(cbInfo.typedefName);
}
const externalTypes = HeaderGeneratorUtils.collectExternalTypes(
groups.functions,
groups.variables,
localTypes.localStructNames,
localTypes.localEnumNames,
localTypeNamesWithCallbacks,
localTypes.localBitmapNames,
allKnownEnums,
);
// Build external type header includes
const { typesWithHeaders, headersToInclude } =
HeaderGeneratorUtils.buildExternalTypeIncludes(
externalTypes,
options.externalTypeHeaders,
);
// Get symbol table for C++ namespace detection
const symbolTable = typeInput?.symbolTable;
// Filter to C-compatible external types
//
// Issue #1200: a callback type (ADR-029) is not an external struct. It is
// emitted as a function-pointer typedef by generateCallbackTypedefSection
// below, so forward-declaring it as `typedef struct X X;` here produces two
// conflicting declarations of the same name -- and the name also belongs to
// the function the type was defined from.
const cCompatibleExternalTypes =
HeaderGeneratorUtils.filterCCompatibleTypes(
externalTypes,
typesWithHeaders,
symbolTable,
).filter((typeName) => !typeInput?.callbackTypes?.has(typeName));
// Filter to C-compatible variables
const cCompatibleVariables =
HeaderGeneratorUtils.filterCCompatibleVariables(
groups.variables,
symbolTable,
);
if (!options.cHeadersIncluded) {
BaseHeaderGenerator.assertNoPointerTypedefs(
cCompatibleExternalTypes,
symbolTable,
filename,
symbols,
);
}
// Build header sections using utility methods
const lines: string[] = [
...HeaderGeneratorUtils.generateHeaderStart(guard, sourcePath),
...HeaderGeneratorUtils.generateIncludes(options, headersToInclude),
...HeaderGeneratorUtils.generateCppWrapperStart(),
...HeaderGeneratorUtils.generateForwardDeclarations(
// #1164: `typedef struct opaque_t* handle_t` is a different type from
// `struct handle_t`, so the usual forward declaration contradicts the
// real definition. Its defining header is included instead, which is
// what cHeadersIncluded means; assertNoPointerTypedefs above has
// already rejected the case where it was not.
options.cHeadersIncluded ? [] : cCompatibleExternalTypes,
),
...HeaderGeneratorUtils.generateIsrTypedefSection(
options.needsIsrTypedef ?? false,
),
...HeaderGeneratorUtils.generateEnumSection(groups.enums, typeInput),
...HeaderGeneratorUtils.generateBitmapSection(groups.bitmaps, typeInput),
...HeaderGeneratorUtils.generateTypeAliasSection(groups.types),
...HeaderGeneratorUtils.generateCallbackStructForwardDecls(
groups.structs,
typeInput,
),
...HeaderGeneratorUtils.generateCallbackTypedefSection(
typeInput,
options.cppMode,
),
...HeaderGeneratorUtils.generateStructSection(
groups.structs,
groups.classes,
typeInput,
),
...HeaderGeneratorUtils.generateVariableSection(cCompatibleVariables),
...this.generateFunctionSection(
groups.functions,
passByValueParams,
allKnownEnums,
),
...HeaderGeneratorUtils.generateHeaderEnd(guard),
];
return lines.join("\n");
}
/**
* Generate function prototypes section
*/
private generateFunctionSection(
functions: IHeaderSymbol[],
passByValueParams?: TPassByValueParams,
allKnownEnums?: ReadonlySet<string>,
): string[] {
if (functions.length === 0) {
return [];
}
const lines: string[] = ["/* Function prototypes */"];
for (const sym of functions) {
const proto = this.generateFunctionPrototype(
sym,
passByValueParams,
allKnownEnums,
);
Eif (proto) {
lines.push(proto);
}
}
lines.push("");
return lines;
}
/**
* Generate a function prototype
*/
private generateFunctionPrototype(
sym: IHeaderSymbol,
passByValueParams?: TPassByValueParams,
allKnownEnums?: ReadonlySet<string>,
): string | null {
// Map return type (main() always returns int)
const mappedType = sym.type ? mapType(sym.type) : "void";
const returnType = sym.name === "main" ? "int" : mappedType;
// Get pass-by-value parameter names for this function
const passByValueSet = passByValueParams?.get(sym.name);
// Build parameter list
let params = "void";
if (sym.parameters && sym.parameters.length > 0) {
const translatedParams = sym.parameters.map((p) =>
this.generateParameter(p, passByValueSet, allKnownEnums),
);
params = translatedParams.join(", ");
}
return `${returnType} ${sym.name}(${params});`;
}
/**
* Generate a single parameter with appropriate semantics
*/
private generateParameter(
p: IParameterSymbol,
passByValueSet?: ReadonlySet<string>,
allKnownEnums?: ReadonlySet<string>,
): string {
// Pre-compute pass-by-value (ISR, float, enum, or explicitly marked)
const isPassByValue =
p.type === "ISR" ||
p.type === "f32" ||
p.type === "f64" ||
allKnownEnums?.has(p.type) ||
passByValueSet?.has(p.name) ||
false;
// Build normalized input using adapter
const input = ParameterInputAdapter.fromSymbol(p, {
mapType: (t) => mapType(t),
isPassByValue,
});
// Use shared builder with subclass-specific ref suffix
return ParameterSignatureBuilder.build(input, this.getRefSuffix());
}
}
export default BaseHeaderGenerator;
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