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infix/src/core/error.c  view on Meta::CPAN

 */
static INFIX_TLS infix_error_details_t g_infix_last_error = {INFIX_CATEGORY_NONE, INFIX_CODE_SUCCESS, 0, 0, {0}};

/**
 * @var g_infix_last_signature_context
 * @brief A thread-local pointer to the full signature string being parsed.
 *
 * @details This is set by the high-level API functions (`infix_type_from_signature`, etc.)
 * before parsing begins. If a parser error occurs, `_infix_set_error` uses this
 * context to generate a rich, contextual error message.
 */
INFIX_TLS const char * g_infix_last_signature_context = nullptr;

/**
 * @internal
 * @brief Maps an `infix_error_code_t` to its human-readable string representation.
 * @param code The error code to map.
 * @return A constant string describing the error.
 */
static const char * _get_error_message_for_code(infix_error_code_t code) {
    switch (code) {
    case INFIX_CODE_SUCCESS:
        return "Success";
    case INFIX_CODE_UNKNOWN:
        return "An unknown error occurred";
    case INFIX_CODE_NULL_POINTER:
        return "A required pointer argument was NULL";
    case INFIX_CODE_MISSING_REGISTRY:
        return "A type registry was required but not provided";
    case INFIX_CODE_NATIVE_EXCEPTION:
        return "A native exception was thrown across the FFI boundary";
    case INFIX_CODE_OUT_OF_MEMORY:
        return "Out of memory";
    case INFIX_CODE_EXECUTABLE_MEMORY_FAILURE:
        return "Failed to allocate executable memory";
    case INFIX_CODE_PROTECTION_FAILURE:
        return "Failed to change memory protection flags";
    case INFIX_CODE_INVALID_ALIGNMENT:
        return "Invalid alignment requested (must be power of two > 0)";
    case INFIX_CODE_UNEXPECTED_TOKEN:
        return "Unexpected token or character";
    case INFIX_CODE_UNTERMINATED_AGGREGATE:
        return "Unterminated aggregate (missing '}', '>', ']', or ')')'";
    case INFIX_CODE_INVALID_KEYWORD:
        return "Invalid type keyword";
    case INFIX_CODE_MISSING_RETURN_TYPE:
        return "Function signature missing '->' or return type";
    case INFIX_CODE_INTEGER_OVERFLOW:
        return "Integer overflow detected during layout calculation";
    case INFIX_CODE_RECURSION_DEPTH_EXCEEDED:
        return "Type definition is too deeply nested";
    case INFIX_CODE_EMPTY_MEMBER_NAME:
        return "Named type was declared with empty angle brackets";
    case INFIX_CODE_EMPTY_SIGNATURE:
        return "The provided signature string was empty";
    case INFIX_CODE_UNSUPPORTED_ABI:
        return "The current platform ABI is not supported";
    case INFIX_CODE_TYPE_TOO_LARGE:
        return "A data type was too large to be handled by the ABI";
    case INFIX_CODE_UNRESOLVED_NAMED_TYPE:
        return "Named type not found in registry or is an undefined forward declaration";
    case INFIX_CODE_INVALID_MEMBER_TYPE:
        return "Aggregate contains an illegal member type (e.g., a struct with a void member)";
    case INFIX_CODE_LIBRARY_NOT_FOUND:
        return "The requested dynamic library could not be found";
    case INFIX_CODE_SYMBOL_NOT_FOUND:
        return "The requested symbol was not found in the library";
    case INFIX_CODE_LIBRARY_LOAD_FAILED:
        return "Loading the dynamic library failed";
    default:
        return "An unknown or unspecified error occurred";
    }
}

/**
 * @internal
 * @brief Sets the last error details for the current thread.
 *
 * If the error is from the parser and a signature context is available, this
 * function generates a rich, multi-line diagnostic message with a code snippet
 * and a caret pointing to the error location. Otherwise, it uses the standard,
 * single-line message for the given error code.
 *
 * @param category The category of the error.
 * @param code The specific error code.
 * @param position For parser errors, the byte offset into the signature string where the error occurred.
 */
void _infix_set_error(infix_error_category_t category, infix_error_code_t code, size_t position) {
    g_infix_last_error.category = category;
    g_infix_last_error.code = code;
    g_infix_last_error.position = position;
    g_infix_last_error.system_error_code = 0;
    // Check if we can generate a rich parser error message.
    if (category == INFIX_CATEGORY_PARSER && g_infix_last_signature_context != nullptr) {
        // Generate a rich, GCC-style error message for parser failures.
        const char * signature = g_infix_last_signature_context;
        size_t sig_len = strlen(signature);
        const size_t radius = 20;  // Number of characters to show around the error position.
        // Calculate the start and end of the snippet to display.
        size_t start = (position > radius) ? (position - radius) : 0;
        size_t end = (position + radius < sig_len) ? (position + radius) : sig_len;
        // Add indicators if the snippet is truncated.
        const char * start_indicator = (start > 0) ? "... " : "";
        const char * end_indicator = (end < sig_len) ? " ..." : "";
        size_t start_indicator_len = (start > 0) ? 4 : 0;
        // Create the code snippet line.
        char snippet[128];
        snprintf(snippet,
                 sizeof(snippet),
                 "%s%.*s%s",
                 start_indicator,
                 (int)(end - start),
                 signature + start,
                 end_indicator);
        // Create the pointer line with a caret '^' under the error.
        char pointer[128];
        size_t caret_pos = position - start + start_indicator_len;
        snprintf(pointer, sizeof(pointer), "%*s^", (int)caret_pos, "");
        // Build the final multi-line message piece by piece to avoid buffer overflows.
        char * p = g_infix_last_error.message;
        size_t remaining = sizeof(g_infix_last_error.message);