diff options
Diffstat (limited to '05/parse.b')
| -rw-r--r-- | 05/parse.b | 111 |
1 files changed, 104 insertions, 7 deletions
@@ -33,20 +33,105 @@ function parse_tokens local b local base_type local base_type_end + local name local prefix local prefix_end local suffix local suffix_end + local is_extern token = tokens :parse_tokens_loop + is_extern = 0 if *1token == TOKEN_EOF goto parse_tokens_eof + if *1token == KEYWORD_STATIC goto parse_static_toplevel_decl + if *1token == KEYWORD_EXTERN goto parse_extern_toplevel_decl if *1token == KEYWORD_TYPEDEF goto parse_typedef - die(.str_parse_tokens_ni) - :str_parse_tokens_ni - string parse_tokens not implemented. + b = token_is_type(token) + if b != 0 goto parse_toplevel_decl + + die(.str_bad_statement) + :str_bad_statement + string Bad statement. byte 0 + :parse_static_toplevel_decl + token += 16 ; we don't care that this is static + goto parse_toplevel_decl + :parse_extern_toplevel_decl + token += 16 + is_extern = 1 + goto parse_toplevel_decl + :parse_toplevel_decl + base_type = token + base_type_end = type_get_base_end(token) + token = base_type_end + :tl_decl_loop + prefix = token + prefix_end = type_get_prefix_end(prefix) + if *1prefix_end != TOKEN_IDENTIFIER goto tl_decl_no_ident + name = prefix_end + 8 + name = *8name + suffix = prefix_end + 16 + suffix_end = type_get_suffix_end(prefix) + type = types_bytes_used + parse_type_declarators(prefix, prefix_end, suffix, suffix_end) + parse_base_type(base_type, base_type_end) + token = suffix_end + if *1token == SYMBOL_LBRACE goto parse_function_definition + if *1token == SYMBOL_SEMICOLON goto parse_tld_no_initializer + if *1token == SYMBOL_COMMA goto parse_tld_no_initializer + if *1token == SYMBOL_EQ goto parse_tld_initializer + token_error(token, .str_unrecognized_stuff_after_declaration) + :str_unrecognized_stuff_after_declaration + string Declaration should be followed by one of: { , = + byte 32 + byte 59 ; semicolon + byte 0 + :parse_tl_decl_cont + if *1token == SYMBOL_SEMICOLON goto tl_decl_loop_done + if *1token != SYMBOL_COMMA goto tld_bad_stuff_after_decl + goto tl_decl_loop + :tl_decl_loop_done + token += 16 ; skip semicolon + goto parse_tokens_loop + + :tl_decl_no_ident + token_error(prefix_end, .str_tl_decl_no_ident) + :str_tl_decl_no_ident + string No identifier in top-level declaration. + byte 0 + :tld_bad_stuff_after_decl + token_error(token, .str_tld_bad_stuff_after_decl) + :str_tld_bad_stuff_after_decl + string Declarations should be immediately followed by a comma or semicolon. + byte 0 + :parse_tld_no_initializer + p = types + type + if *1p == TYPE_FUNCTION goto parse_tl_decl_cont ; ignore function declarations -- we do two passes anyways + ident_list_add(global_variables, name, rwdata_end_addr) + ; just skip forward by the size of this variable -- it'll automatically be filled with 0s. + rwdata_end_addr += type_sizeof(type) + goto parse_tl_decl_cont + :parse_tld_initializer + die(.str_tldinNI) ; @TODO + :str_tldinNI + string tld initializer not implemented. + byte 10 + byte 0 + :parse_function_definition + p = types + type + if *1p != TYPE_FUNCTION goto lbrace_after_declaration + die(.str_fdNI) ; @TODO + :str_fdNI + string function definitions not implemented. + byte 10 + byte 0 + :lbrace_after_declaration + token_error(token, .str_lbrace_after_declaration) + :str_lbrace_after_declaration + string Opening { after declaration of non-function. + byte 0 :parse_typedef base_type = token + 16 base_type_end = type_get_base_end(base_type) @@ -359,6 +444,11 @@ function parse_type_declarators *1out = TYPE_ARRAY types_bytes_used += 1 + p = suffix + token_skip_to_matching_rsquare(&p) + suffix += 16 ; skip [ + if *1suffix == SYMBOL_RSQUARE goto array_no_size + ; little hack to avoid screwing up types like double[sizeof(int)] ; temporarily pretend we're using a lot more of types local prev_types_bytes_used @@ -366,9 +456,7 @@ function parse_type_declarators types_bytes_used += 4000 expr = malloc(4000) - p = suffix - token_skip_to_matching_rsquare(&p) - suffix += 16 ; skip [ + parse_expression(suffix, p, expr) ;print_expression(expr) ;putc(10) @@ -388,7 +476,14 @@ function parse_type_declarators token_error(suffix, .str_bad_array_size) :str_bad_array_size string Very large or negative array size. - byte 0 + byte 0 + :array_no_size + ; e.g. int x[] = {1,2,3}; + out = types + types_bytes_used + *8out = 0 + types_bytes_used += 8 + suffix += 16 + goto type_declarators_loop :parse_function_type local param_base_type local param_prefix @@ -605,6 +700,8 @@ function parse_base_type out += 1 goto base_type_done :base_type_struct_definition + ; @NONSTANDARD: we don't handle bit-fields. + local member_base_type local member_prefix local member_prefix_end |