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omicron 2025-04-02 15:39:41 +02:00
parent dabd3fd86f
commit 000756fca9
1 changed files with 84 additions and 0 deletions
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84
src/parser/parser.c
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@ -12,6 +12,90 @@ parse_result_t parse_number(tokenlist_entry_t *current) {
return parse_any(current, parsers);
}
parse_result_t parse_plus_or_minus(tokenlist_entry_t *current) {
parser_t parsers[] = {parse_plus, parse_minus, nullptr};
return parse_any(current, parsers);
}
parse_result_t parse_register_index(tokenlist_entry_t *current) {
parser_t parsers[] = {parse_plus, parse_register, parse_asterisk,
parse_number, nullptr};
return parse_consecutive(current, NODE_LABEL, parsers);
}
parse_result_t parse_register_offset(tokenlist_entry_t *current) {
parser_t parsers[] = {parse_plus_or_minus, parse_number, nullptr};
return parse_consecutive(current, NODE_LABEL, parsers);
}
parse_result_t parse_register_expression(tokenlist_entry_t *current) {
parse_result_t result;
ast_node_t *expr;
error_t *err = ast_node_alloc(&expr);
if (err)
return parse_error(err);
// <register>
result = parse_register(current);
if (result.err) {
ast_node_free(expr);
return result;
}
err = ast_node_add_child(expr, result.node);
if (err) {
ast_node_free(result.node);
ast_node_free(expr);
return parse_error(err);
}
current = result.next;
// <register_index>?
result = parse_register_index(current);
if (result.err) {
error_free(result.err);
} else {
err = ast_node_add_child(expr, result.node);
if (err) {
ast_node_free(result.node);
ast_node_free(expr);
return parse_error(err);
}
current = result.next;
}
// <register_offset>?
result = parse_register_offset(current);
if (result.err) {
error_free(result.err);
} else {
err = ast_node_add_child(expr, result.node);
if (err) {
ast_node_free(result.node);
ast_node_free(expr);
return parse_error(err);
}
current = result.next;
}
return parse_success(expr, current);
}
parse_result_t parse_immediate(tokenlist_entry_t *current) {
parser_t parsers[] = {parse_number, parse_identifier, nullptr};
return parse_any(current, parsers);
}
parse_result_t parse_memory_expression(tokenlist_entry_t *current) {
parser_t parsers[] = {parse_register_expression, parse_identifier, nullptr};
return parse_any(current, parsers);
}
parse_result_t parse_memory(tokenlist_entry_t *current) {
parser_t parsers[] = {parse_lbracket, parse_memory_expression,
parse_rbracket, nullptr};
return parse_consecutive(current, NODE_LABEL, parsers);
}
parse_result_t parse_operand(tokenlist_entry_t *current) {
// FIXME: not the correct set of parsers
parser_t parsers[] = {parse_register, parse_number, nullptr};