1739 lines
38 KiB
Plaintext
1739 lines
38 KiB
Plaintext
(* This Source Code Form is subject to the terms of the Mozilla Public License, *)
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(* v. 2.0. If a copy of the MPL was not distributed with this file, You can *)
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(* obtain one at https://mozilla.org/MPL/2.0/. *)
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(* Stage 11 compiler. *)
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(* - Removed support for inline assembly statements. *)
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(* - Assignment to global variables. *)
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(* - In procedure declarations skip everything between parameter parens. *)
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const
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symbol_builtin_name_int := "Int";
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symbol_builtin_name_word := "Word";
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symbol_builtin_name_pointer := "Pointer";
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symbol_builtin_name_char := "Char";
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symbol_builtin_name_bool := "Bool";
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(* Every type info starts with a word describing what type it is. *)
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(* PRIMITIVE_TYPE = 1 *)
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(* Primitive types have only type size. *)
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symbol_builtin_type_int := S(1, 4);
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symbol_builtin_type_word := S(1, 4);
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symbol_builtin_type_pointer := S(1, 4);
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symbol_builtin_type_char := S(1, 1);
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symbol_builtin_type_bool := S(1, 1);
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(* Info objects start with a word describing its type. *)
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(* INFO_TYPE = 1 *)
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(* Type info has the type it belongs to. *)
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symbol_type_info_int := S(1, @symbol_builtin_type_int);
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symbol_type_info_word := S(1, @symbol_builtin_type_word);
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symbol_type_info_pointer := S(1, @symbol_builtin_type_pointer);
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symbol_type_info_char := S(1, @symbol_builtin_type_char);
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symbol_type_info_bool := S(1, @symbol_builtin_type_bool);
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var
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source_code: Array;
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compiler_strings: Array;
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symbol_table_global: Array;
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symbol_table_local: Array;
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classification: Array;
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compiler_strings_position: Pointer := @compiler_strings;
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compiler_strings_length: Word := 0;
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label_counter: Word := 0;
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source_code_position: Pointer := @source_code;
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(* Calculates and returns the string token length between quotes, including the *)
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(* escaping slash characters. *)
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(* Parameters: *)
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(* a0 - String token pointer. *)
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(* Returns the length in a0. *)
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proc _string_length();
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begin
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(* Reset the counter. *)
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v0 := 0;
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.string_length_loop;
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v88 := v88 + 1;
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if _load_byte(v88) <> '"' then
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v0 := v0 + 1;
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goto .string_length_loop;
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end;
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return v0
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end;
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(* Adds a string to the global, read-only string storage. *)
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(* Parameters: *)
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(* a0 - String token. *)
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(* Returns the offset from the beginning of the storage to the new string in a0. *)
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proc _add_string();
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begin
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v0 := v88 + 1;
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v4 := compiler_strings_length;
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.add_string_loop;
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if _load_byte(v0) <> '"' then
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v8 := _load_byte(v0);
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_store_byte(v8, compiler_strings_position);
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_store_word(compiler_strings_position + 1, @compiler_strings_position);
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v0 := v0 + 1;
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if v8 <> '\\' then
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_store_word(compiler_strings_length + 1, @compiler_strings_length);
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end;
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goto .add_string_loop;
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end;
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return v4
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end;
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(* Reads standard input into a buffer. *)
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(* a0 - Buffer pointer. *)
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(* a1 - Buffer size. *)
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(* Returns the amount of bytes written in a0. *)
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proc _read_file();
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begin
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_syscall(0, v88, v84, 0, 0, 0, 63);
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end;
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(* Writes to the standard output. *)
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(* Parameters: *)
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(* a0 - Buffer. *)
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(* a1 - Buffer length. *)
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proc _write_s();
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begin
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_syscall(1, v88, v84, 0, 0, 0, 64);
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end;
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(* Writes a number to a string buffer. *)
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(* t0 - Local buffer. *)
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(* t1 - Constant 10. *)
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(* t2 - Current character. *)
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(* t3 - Whether the number is negative. *)
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(* Parameters: *)
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(* a0 - Whole number. *)
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(* a1 - Buffer pointer. *)
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(* Sets a0 to the length of the written number. *)
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proc _print_i();
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begin
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v0 := @v23;
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if v88 >= 0 then
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v4 := 0;
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else
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v88 = -v88;
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v4 := 1;
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end;
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.print_i_digit10;
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v8 := v88 % 10;
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_store_byte(v8 + '0', v0);
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v88 := v88 / 10;
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v0 := v0 + -1;
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if v88 <> 0 then
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goto .print_i_digit10;
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end;
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if v4 = 1 then
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_store_byte('-', v0);
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v0 := v0 + -1;
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end;
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v4 := @v23 + -v0;
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_memcpy(v84, v0 + 1, v4);
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return v4
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end;
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(* Writes a number to the standard output. *)
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(* Parameters: *)
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(* a0 - Whole number. *)
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proc _write_i();
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begin
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v4 := _print_i(v88, @v0);
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_write_s(@v0, v4);
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end;
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(* Writes a character from a0 into the standard output. *)
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proc _write_c();
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begin
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_write_s(@v88, 1);
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end;
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(* Write null terminated string. *)
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(* Parameters: *)
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(* a0 - String. *)
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proc _write_z();
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begin
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(* Check for 0 character. *)
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v0 := _load_byte(v88);
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if v0 <> 0 then
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(* Print a character. *)
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_write_c(v0);
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(* Advance the input string by one byte. *)
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_write_z(v88 + 1);
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end;
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end;
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(* Detects if a0 is an uppercase character. Sets a0 to 1 if so, otherwise to 0. *)
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proc _is_upper();
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begin
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v0 := v88 >= 'A';
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v4 := v88 <= 'Z';
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return v0 & v4
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end;
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(* Detects if a0 is an lowercase character. Sets a0 to 1 if so, otherwise to 0. *)
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proc _is_lower();
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begin
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v0 := v88 >= 'a';
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v4 := v88 <= 'z';
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return v0 & v4
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end;
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(* Detects if the passed character is a 7-bit alpha character or an underscore. *)
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(* Paramters: *)
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(* a0 - Tested character. *)
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(* Sets a0 to 1 if the character is an alpha character or underscore, sets it to 0 otherwise. *)
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proc _is_alpha();
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begin
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v0 := _is_upper(v88);
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v4 := _is_lower(v88);
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v8 := v88 = '_';
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v12 := v0 or v4;
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return v12 or v8
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end;
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(* Detects whether the passed character is a digit *)
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(* (a value between 0 and 9). *)
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(* Parameters: *)
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(* a0 - Exemined value. *)
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(* Sets a0 to 1 if it is a digit, to 0 otherwise. *)
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proc _is_digit();
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begin
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v0 := v88 >= '0';
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v4 := v88 <= '9';
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return v0 & v4
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end;
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proc _is_alnum();
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begin
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v0 := _is_alpha(v88);
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v4 := _is_digit(v88);
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return v0 or v4
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end;
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(* Reads the next token. *)
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(* Returns token length in a0. *)
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proc _read_token();
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begin
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(* Current token position. *)
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v0 := source_code_position;
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(* Token length. *)
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v4 := 0;
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.read_token_loop;
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(* Current character. *)
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v8 := _load_byte(v0);
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(* First we try to read a derictive. *)
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(* A derictive can contain a dot and characters. *)
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v12 := v8 = '.';
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v16 := _is_alnum(v8);
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if v12 or v16 then
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(* Advance the source code position and token length. *)
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v4 := v4 + 1;
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v0 := v0 + 1;
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goto .read_token_loop;
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end;
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return v4
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end;
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(* a0 - First pointer. *)
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(* a1 - Second pointer. *)
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(* a2 - The length to compare. *)
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(* Returns 0 in a0 if memory regions are equal. *)
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proc _memcmp();
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begin
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v8 := 0;
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.memcmp_loop;
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if v80 <> 0 then
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v0 := _load_byte(v88);
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v4 := _load_byte(v84);
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v8 := v0 + -v4;
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v88 := v88 + 1;
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v84 := v84 + 1;
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v80 := v80 + -1;
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if v8 = 0 then
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goto .memcmp_loop;
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end;
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end;
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return v8
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end;
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(* Copies memory. *)
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(* Parameters: *)
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(* a0 - Destination. *)
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(* a1 - Source. *)
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(* a2 - Size. *)
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(* Preserves a0. *)
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proc _memcpy();
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begin
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.memcpy_loop;
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if v80 <> 0 then
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v0 := _load_byte(v84);
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_store_byte(v0, v88);
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v88 := v88 + 1;
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v84 := v84 + 1;
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v80 := v80 + -1;
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goto .memcpy_loop;
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end;
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return v88
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end;
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(* Advances the token stream by a0 bytes. *)
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proc _advance_token();
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begin
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_store_word(source_code_position + v88, @source_code_position);
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end;
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(* Prints the current token. *)
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(* Parameters: *)
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(* a0 - Token length. *)
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(* Returns a0 unchanged. *)
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proc _write_token();
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begin
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_write_s(source_code_position, v88);
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return v88
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end;
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proc _compile_integer_literal();
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begin
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_write_z("\tli t0, \0");
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v0 := _read_token();
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_write_token(v0);
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_advance_token(v0);
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_write_c('\n');
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end;
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proc _compile_character_literal();
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begin
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_write_z("\tli t0, \0");
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_write_c('\'');
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_advance_token(1);
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v0 := _load_byte(source_code_position);
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if v0 = '\\' then
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_write_c('\\');
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_advance_token(1);
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end;
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v0 := _load_byte(source_code_position);
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_write_c(v0);
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_write_c('\'');
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_write_c('\n');
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_advance_token(2);
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end;
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proc _compile_variable_expression();
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begin
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_compile_designator();
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_write_z("\tlw t0, (t0)\n\0");
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end;
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proc _compile_address_expression();
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begin
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(* Skip the "@" sign. *)
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_advance_token(1);
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_compile_designator();
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end;
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proc _compile_negate_expression();
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begin
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(* Skip the "-" sign. *)
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_advance_token(1);
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_compile_term();
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_write_z("\tneg t0, t0\n\0");
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end;
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proc _compile_not_expression();
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begin
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(* Skip the "~" sign. *)
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_advance_token(1);
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_compile_term();
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_write_z("\tnot t0, t0\n\0");
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end;
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proc _compile_string_literal();
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begin
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v0 := _string_length(source_code_position);
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v4 := _add_string(source_code_position);
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_advance_token(v0 + 2);
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_write_z("\tla t0, strings\n\0");
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_write_z("\tli t1, \0");
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_write_i(v4);
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_write_c('\n');
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_write_z("\tadd t0, t0, t1\n\0");
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end;
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proc _compile_term();
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begin
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v0 := _load_byte(source_code_position);
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if v0 = '\'' then
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_compile_character_literal();
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end;
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if v0 = '@' then
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_compile_address_expression();
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end;
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if v0 = '-' then
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_compile_negate_expression();
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end;
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if v0 = '~' then
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_compile_not_expression();
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end;
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if v0 = '"' then
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_compile_string_literal();
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end;
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if v0 = '_' then
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_compile_call();
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_write_z("\nmv t0, a0\n\0");
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end;
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if _is_digit(v0) = 1 then
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_compile_integer_literal();
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end;
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if _is_lower(v0) = 1 then
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_compile_variable_expression();
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end;
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end;
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proc _compile_binary_rhs();
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begin
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(* Skip the whitespace after the binary operator. *)
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_advance_token(1);
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_compile_term();
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(* Load the left expression from the stack; *)
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_write_z("\tlw t1, 24(sp)\n\0");
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end;
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proc _compile_expression();
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begin
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_compile_term();
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v0 := _load_byte(source_code_position);
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if v0 <> ' ' then
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goto .compile_expression_end;
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end;
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(* It is a binary expression. *)
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(* Save the value of the left expression on the stack. *)
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_write_z("sw t0, 24(sp)\n\0");
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(* Skip surrounding whitespace in front of the operator. *)
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_advance_token(1);
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v0 := _load_byte(source_code_position);
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if v0 = '+' then
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_advance_token(1);
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_compile_binary_rhs();
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(* Execute the operation. *)
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_write_z("add t0, t0, t1\n\0");
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goto .compile_expression_end;
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end;
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if v0 = '*' then
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_advance_token(1);
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_compile_binary_rhs();
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(* Execute the operation. *)
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_write_z("\tmul t0, t0, t1\n\0");
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goto .compile_expression_end;
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end;
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if v0 = '&' then
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_advance_token(1);
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_compile_binary_rhs();
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(* Execute the operation. *)
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_write_z("\tand t0, t0, t1\n\0");
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goto .compile_expression_end;
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end;
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if v0 = 'o' then
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_advance_token(2);
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_compile_binary_rhs();
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(* Execute the operation. *)
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_write_z("or t0, t0, t1\n\0");
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goto .compile_expression_end;
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end;
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if v0 = 'x' then
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_advance_token(3);
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_compile_binary_rhs();
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(* Execute the operation. *)
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_write_z("xor t0, t0, t1\n\0");
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goto .compile_expression_end;
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end;
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if v0 = '=' then
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_advance_token(1);
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_compile_binary_rhs();
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(* Execute the operation. *)
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_write_z("xor t0, t0, t1\nseqz t0, t0\n\0");
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goto .compile_expression_end;
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end;
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if v0 = '%' then
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_advance_token(1);
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_compile_binary_rhs();
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(* Execute the operation. *)
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_write_z("rem t0, t1, t0\n\0");
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goto .compile_expression_end;
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end;
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if v0 = '/' then
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_advance_token(1);
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_compile_binary_rhs();
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(* Execute the operation. *)
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_write_z("div t0, t1, t0\n\0");
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goto .compile_expression_end;
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end;
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if v0 = '<' then
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_advance_token(1);
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v0 := _load_byte(source_code_position);
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|
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if v0 = '>' then
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_advance_token(1);
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_compile_binary_rhs();
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|
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(* Execute the operation. *)
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|
_write_z("\txor t0, t0, t1\nsnez t0, t0\n\0");
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goto .compile_expression_end;
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end;
|
|
if v0 = '=' then
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_advance_token(1);
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_compile_binary_rhs();
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|
|
(* Execute the operation. *)
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_write_z("\tslt t0, t0, t1\nxori t0, t0, 1\n\0");
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goto .compile_expression_end;
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end;
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_compile_binary_rhs();
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|
(* Execute the operation. *)
|
|
_write_z("slt t0, t1, t0\n\0");
|
|
|
|
goto .compile_expression_end;
|
|
end;
|
|
if v0 = '>' then
|
|
_advance_token(1);
|
|
v0 := _load_byte(source_code_position);
|
|
if v0 = '=' then
|
|
_advance_token(1);
|
|
_compile_binary_rhs();
|
|
|
|
(* Execute the operation. *)
|
|
_write_z("\tslt t0, t1, t0\nxori t0, t0, 1\n\0");
|
|
|
|
goto .compile_expression_end;
|
|
end;
|
|
_compile_binary_rhs();
|
|
|
|
(* Execute the operation. *)
|
|
_write_z("\tslt t0, t1, t0\n\0");
|
|
|
|
goto .compile_expression_end;
|
|
end;
|
|
|
|
.compile_expression_end;
|
|
end;
|
|
|
|
proc _compile_call();
|
|
begin
|
|
(* Stack variables: *)
|
|
(* v0 - Procedure name length. *)
|
|
(* v4 - Procedure name pointer. *)
|
|
(* v8 - Argument count. *)
|
|
|
|
v0 := _read_token();
|
|
v4 := source_code_position;
|
|
v8 := 0;
|
|
|
|
(* Skip the identifier and left paren. *)
|
|
_advance_token(v0 + 1);
|
|
v12 := _load_byte(source_code_position);
|
|
|
|
if v12 = ')' then
|
|
goto .compile_call_finalize
|
|
end;
|
|
.compile_call_loop;
|
|
_compile_expression();
|
|
|
|
(* Save the argument on the stack. *)
|
|
_write_z("\tsw t0, \0");
|
|
|
|
(* Calculate the stack offset: 116 - (4 * argument_counter) *)
|
|
v12 := v8 * 4;
|
|
v12 := 116 + -v12;
|
|
_write_i(v12);
|
|
|
|
_write_z("(sp)\n\0");
|
|
|
|
(* Add one to the argument counter. *)
|
|
v8 := v8 + 1;
|
|
|
|
v12 := _load_byte(source_code_position);
|
|
|
|
if v12 <> ',' then
|
|
goto .compile_call_finalize;
|
|
end;
|
|
_advance_token(2);
|
|
goto .compile_call_loop;
|
|
|
|
.compile_call_finalize;
|
|
(* Load the argument from the stack. *)
|
|
if v8 <> 0 then
|
|
(* Decrement the argument counter. *)
|
|
v8 := v8 + -1;
|
|
|
|
_write_z("\tlw a\0");
|
|
_write_i(v8);
|
|
|
|
_write_z(", \0");
|
|
|
|
(* Calculate the stack offset: 116 - (4 * argument_counter) *)
|
|
v12 := v8 * 4;
|
|
v12 := 116 + -v12;
|
|
_write_i(v12);
|
|
|
|
_write_z("(sp)\n\0");
|
|
|
|
goto .compile_call_finalize;
|
|
end;
|
|
|
|
.compile_call_end;
|
|
_write_z("\tcall \0");
|
|
_write_s(v4, v0);
|
|
|
|
(* Skip the right paren. *)
|
|
_advance_token(1);
|
|
end;
|
|
|
|
proc _compile_goto();
|
|
begin
|
|
_advance_token(5);
|
|
|
|
v0 := _read_token();
|
|
_write_z("\tj \0");
|
|
|
|
_write_token(v0);
|
|
_advance_token();
|
|
end;
|
|
|
|
proc _compile_local_designator();
|
|
begin
|
|
(* Skip "v" in the local variable name. *)
|
|
_advance_token(1);
|
|
_write_z("\t addi t0, sp, \0");
|
|
|
|
(* Read local variable stack offset and save it. *)
|
|
v0 := _read_token();
|
|
_write_token(v0);
|
|
_advance_token(v0);
|
|
_write_c('\n');
|
|
end;
|
|
|
|
proc _compile_global_designator();
|
|
begin
|
|
_write_z("\tla t0, \0");
|
|
|
|
v0 := _read_token();
|
|
_write_token(v0);
|
|
_advance_token(v0);
|
|
|
|
_write_c('\n');
|
|
end;
|
|
|
|
proc _compile_designator();
|
|
begin
|
|
if _load_byte(source_code_position) = 'v' then
|
|
_compile_local_designator();
|
|
else
|
|
_compile_global_designator();
|
|
end;
|
|
end;
|
|
|
|
proc _compile_assignment();
|
|
begin
|
|
_compile_designator();
|
|
|
|
(* Save the assignee address on the stack. *)
|
|
_write_z("\tsw t0, 60(sp)\n\0");
|
|
|
|
(* Skip the assignment sign (:=) with surrounding whitespaces. *)
|
|
_advance_token(4);
|
|
|
|
(* Compile the assignment. *)
|
|
_compile_expression();
|
|
|
|
_write_z("\tlw t1, 60(sp)\nsw t0, (t1)\n\0");
|
|
end;
|
|
|
|
proc _compile_return_statement();
|
|
begin
|
|
(* Skip "return" keyword and whitespace after it. *)
|
|
_advance_token(7);
|
|
_compile_expression();
|
|
|
|
_write_z("mv a0, t0\n\0");
|
|
end;
|
|
|
|
(* Writes a label, .Ln, where n is a unique number. *)
|
|
|
|
(* Parameters: *)
|
|
(* a0 - Label counter. *)
|
|
proc _write_label();
|
|
begin
|
|
_write_z(".L\0");
|
|
_write_i(v88);
|
|
end;
|
|
|
|
proc _compile_if();
|
|
begin
|
|
(* Skip "if ". *)
|
|
_advance_token(3);
|
|
(* Compile condition. *)
|
|
_compile_expression();
|
|
(* Skip " then" with newline. *)
|
|
_advance_token(6);
|
|
|
|
(* v0 is the label after the if statement. *)
|
|
v0 := label_counter;
|
|
_store_word(label_counter + 1, @label_counter);
|
|
(* v4 is the label in front of the next elsif condition or end. *)
|
|
v4 := label_counter;
|
|
_store_word(label_counter + 1, @label_counter);
|
|
|
|
_write_z("\tbeqz t0, \0");
|
|
_write_label(v4);
|
|
_write_c('\n');
|
|
|
|
_compile_procedure_body();
|
|
|
|
_write_z("\tj \0");
|
|
_write_label(v0);
|
|
_write_c('\n');
|
|
|
|
_write_label(v4);
|
|
_write_z(":\n\0");
|
|
|
|
if _memcmp(source_code_position, "end", 3) = 0 then
|
|
goto .compile_if_end;
|
|
end;
|
|
if _memcmp(source_code_position, "else", 3) = 0 then
|
|
goto .compile_if_else
|
|
end;
|
|
.compile_if_else;
|
|
(* Skip "else" and newline. *)
|
|
_advance_token(5);
|
|
_compile_procedure_body();
|
|
|
|
.compile_if_end;
|
|
(* Skip "end". *)
|
|
_advance_token(3);
|
|
|
|
_write_label(v0);
|
|
_write_z(":\n\0");
|
|
end;
|
|
|
|
proc _compile_label_declaration();
|
|
begin
|
|
(* Skip the dot. *)
|
|
_advance_token(1);
|
|
v0 := _read_token();
|
|
_write_c('.');
|
|
_write_s(source_code_position, v0);
|
|
_write_z(":\n\0");
|
|
_advance_token(v0);
|
|
end;
|
|
|
|
proc _compile_statement();
|
|
begin
|
|
_skip_spaces();
|
|
v0 := _load_byte(source_code_position);
|
|
|
|
(* This is a call if the statement starts with an underscore. *)
|
|
if v0 = '_' then
|
|
_compile_call();
|
|
goto .compile_statement_semicolon;
|
|
end;
|
|
if v0 = 'g' then
|
|
_compile_goto();
|
|
goto .compile_statement_semicolon;
|
|
end;
|
|
if v0 = 'i' then
|
|
_compile_if();
|
|
goto .compile_statement_semicolon;
|
|
end;
|
|
if v0 = 'r' then
|
|
_compile_return_statement();
|
|
_write_c('\n');
|
|
|
|
goto .compile_statement_end;
|
|
end;
|
|
if v0 = '.' then
|
|
_compile_label_declaration();
|
|
|
|
goto .compile_statement_semicolon;
|
|
end;
|
|
_compile_assignment();
|
|
goto .compile_statement_semicolon;
|
|
|
|
.compile_statement_semicolon;
|
|
_advance_token(2);
|
|
_write_c('\n');
|
|
|
|
.compile_statement_end;
|
|
end;
|
|
|
|
proc _compile_procedure_body();
|
|
begin
|
|
.compile_procedure_body_loop;
|
|
_skip_empty_lines();
|
|
_skip_spaces();
|
|
|
|
v0 := _memcmp(source_code_position, "end", 3) = 0;
|
|
v4 := _memcmp(source_code_position, "else", 4) = 0;
|
|
v4 := v0 or v4;
|
|
|
|
if v4 = 0 then
|
|
_compile_statement();
|
|
goto .compile_procedure_body_loop;
|
|
end;
|
|
end;
|
|
|
|
(* Writes a regster name to the standard output. *)
|
|
|
|
(* Parameters: *)
|
|
(* a0 - Register character. *)
|
|
(* a1 - Register number. *)
|
|
proc _write_register();
|
|
begin
|
|
_write_c(v88);
|
|
v84 := v84 + '0';
|
|
_write_c(v84);
|
|
end;
|
|
|
|
proc _compile_procedure_prologue();
|
|
begin
|
|
(* Skip open paren. *)
|
|
_advance_token(1);
|
|
v0 := 0;
|
|
|
|
.compile_procedure_prologue_skip;
|
|
if _load_byte(source_code_position) <> ')' then
|
|
_advance_token(1);
|
|
goto .compile_procedure_prologue_skip;
|
|
end;
|
|
|
|
.compile_procedure_prologue_loop;
|
|
_write_z("\tsw a\0");
|
|
_write_i(v0);
|
|
_write_z(", \0");
|
|
|
|
(* Calculate the stack offset: 88 - (4 * parameter_counter) *)
|
|
v4 := v0 * 4;
|
|
v4 := 88 + -v4;
|
|
_write_i(v4);
|
|
|
|
_write_z("(sp)\n\0");
|
|
|
|
v0 := v0 + 1;
|
|
if v0 <> 8 then
|
|
goto .compile_procedure_prologue_loop;
|
|
end;
|
|
(* Skip close paren. *)
|
|
_advance_token(1);
|
|
end;
|
|
|
|
proc _compile_procedure();
|
|
begin
|
|
(* Skip "proc ". *)
|
|
_advance_token(5);
|
|
|
|
(* Save the procedure name length. *)
|
|
v0 := _read_token();
|
|
|
|
(* Write .type _procedure_name, @function. *)
|
|
_write_z(".type \0");
|
|
|
|
_write_token(v0);
|
|
_write_z(", @function\n\0");
|
|
|
|
(* Write procedure label, _procedure_name: *)
|
|
_write_token(v0);
|
|
_write_z(":\n\0");
|
|
|
|
(* Skip procedure name. *)
|
|
_advance_token(v0);
|
|
_write_z("\taddi sp, sp, -128\n\tsw ra, 124(sp)\n\tsw s0, 120(sp)\n\taddi s0, sp, 128\n\0");
|
|
_compile_procedure_prologue();
|
|
|
|
(* Skip semicolon, "begin" and newline. *)
|
|
_advance_token(8);
|
|
|
|
_compile_procedure_body();
|
|
|
|
(* Write the epilogue. *)
|
|
_write_z("\tlw ra, 124(sp)\n\tlw s0, 120(sp)\n\taddi sp, sp, 128\n\tret\n\0");
|
|
|
|
(* Skip the "end" keyword, semicolon and newline. *)
|
|
_advance_token(5);
|
|
end;
|
|
|
|
proc _skip_spaces();
|
|
begin
|
|
v0 := _load_byte(source_code_position);
|
|
if v0 = '\t' then
|
|
_advance_token(1);
|
|
_skip_spaces();
|
|
end;
|
|
end;
|
|
|
|
(* Prints and skips a line. *)
|
|
proc _skip_comment();
|
|
begin
|
|
.skip_comment_loop;
|
|
v0 := _load_byte(source_code_position);
|
|
|
|
(* Check for newline character. *)
|
|
if v0 <> '\n' then
|
|
(* Advance the input string by one byte. *)
|
|
_advance_token(1);
|
|
|
|
goto .skip_comment_loop;
|
|
end;
|
|
(* Skip the newline. *)
|
|
_advance_token(1);
|
|
end;
|
|
|
|
(* Skip newlines and comments. *)
|
|
proc _skip_empty_lines();
|
|
begin
|
|
.skip_empty_lines_rerun;
|
|
v0 := source_code_position;
|
|
|
|
.skip_empty_lines_loop;
|
|
v4 := _load_byte(v0);
|
|
|
|
if v4 = '\n' then
|
|
goto .skip_empty_lines_newline;
|
|
end;
|
|
if v4 = '\t' then
|
|
goto .skip_empty_lines_tab;
|
|
end;
|
|
if v4 <> '(' then
|
|
goto .skip_empty_lines_end;
|
|
end;
|
|
v4 := v0 + 1;
|
|
|
|
if _load_byte(v4) = '*' then
|
|
goto .skip_empty_lines_comment
|
|
end;
|
|
goto .skip_empty_lines_end;
|
|
|
|
.skip_empty_lines_comment;
|
|
_store_word(v0, @source_code_position);
|
|
_skip_comment();
|
|
goto .skip_empty_lines_rerun;
|
|
|
|
.skip_empty_lines_newline;
|
|
_store_word(v0 + 1, @source_code_position);
|
|
goto .skip_empty_lines_rerun;
|
|
|
|
.skip_empty_lines_tab;
|
|
v0 := v0 + 1;
|
|
goto .skip_empty_lines_loop
|
|
|
|
.skip_empty_lines_end;
|
|
end;
|
|
|
|
proc _compile_global_initializer();
|
|
begin
|
|
v0 := _load_byte(source_code_position);
|
|
|
|
if v0 = '"' then
|
|
_write_z("\n\t.word strings + \0");
|
|
v4 := _string_length(source_code_position);
|
|
|
|
_add_string(source_code_position);
|
|
_write_i();
|
|
|
|
(* Skip the quoted string. *)
|
|
_advance_token(v4 + 2);
|
|
|
|
goto .compile_global_initializer_end;
|
|
end;
|
|
if v0 = 'S' then
|
|
(* Skip "S(". *)
|
|
_advance_token(2);
|
|
|
|
if _load_byte(source_code_position) = ')' then
|
|
goto .compile_global_initializer_closing;
|
|
end;
|
|
goto .compile_global_initializer_loop;
|
|
end;
|
|
if v0 = '@' then
|
|
(* Skip @. *)
|
|
_advance_token(1);
|
|
_write_z("\n\t.word \0");
|
|
v0 := _read_token();
|
|
_write_token(v0);
|
|
_advance_token(v0);
|
|
|
|
goto .compile_global_initializer_end;
|
|
end;
|
|
if _is_digit(v0) = 1 then
|
|
_write_z("\n\t.word \0");
|
|
v0 := _read_token();
|
|
_write_token(v0);
|
|
_advance_token(1);
|
|
|
|
goto .compile_global_initializer_end;
|
|
end;
|
|
|
|
.compile_global_initializer_loop;
|
|
_compile_global_initializer();
|
|
|
|
if _load_byte(source_code_position) <> ')' then
|
|
(* Skip comma and whitespace after it. *)
|
|
_advance_token(2);
|
|
|
|
goto .compile_global_initializer_loop;
|
|
end;
|
|
|
|
.compile_global_initializer_closing;
|
|
(* Skip ")" *)
|
|
_advance_token(1);
|
|
|
|
goto .compile_global_initializer_end;
|
|
|
|
.compile_global_initializer_end;
|
|
end;
|
|
|
|
proc _compile_constant_declaration();
|
|
begin
|
|
v0 := _read_token();
|
|
|
|
_write_z(".type \0");
|
|
_write_token(v0);
|
|
_write_z(", @object\n\0");
|
|
|
|
_write_token(v0);
|
|
_write_c(':');
|
|
|
|
(* Skip the constant name with assignment sign and surrounding whitespaces. *)
|
|
_advance_token(v0 + 4);
|
|
_compile_global_initializer();
|
|
(* Skip semicolon and newline. *)
|
|
_advance_token(2);
|
|
_write_c('\n');
|
|
end;
|
|
|
|
proc _compile_const_part();
|
|
begin
|
|
_skip_empty_lines();
|
|
|
|
if _memcmp(source_code_position, "const\0", 5) <> 0 then
|
|
goto .compile_const_part_end;
|
|
end;
|
|
(* Skip "const" with the newline after it. *)
|
|
_advance_token(6);
|
|
_write_z(".section .rodata # Compiled from const section.\n\n\0");
|
|
|
|
.compile_const_part_loop;
|
|
_skip_empty_lines();
|
|
|
|
(* If the character at the line beginning is not indentation, *)
|
|
(* it is probably the next code section. *)
|
|
if _load_byte(source_code_position) = '\t' then
|
|
_advance_token(1);
|
|
|
|
_compile_constant_declaration();
|
|
goto .compile_const_part_loop;
|
|
end;
|
|
|
|
.compile_const_part_end;
|
|
end;
|
|
|
|
proc _compile_variable_declaration();
|
|
begin
|
|
v0 := _read_token();
|
|
|
|
_write_z(".type \0");
|
|
_write_token(v0);
|
|
_write_z(", @object\n\0");
|
|
|
|
_write_token(v0);
|
|
_write_c(':');
|
|
|
|
(* Skip the variable name and colon with space before the type. *)
|
|
_advance_token(v0 + 2);
|
|
|
|
(* Skip the type name. *)
|
|
v4 := _read_token();
|
|
_advance_token(v4);
|
|
|
|
if _load_byte(source_code_position) <> ' ' then
|
|
(* Else we assume this is a zeroed 81920 bytes big array. *)
|
|
_write_z(" .zero 81920\0");
|
|
else
|
|
(* Skip the assignment sign with surrounding whitespaces. *)
|
|
_advance_token(4);
|
|
_compile_global_initializer();
|
|
end;
|
|
|
|
(* Skip semicolon and newline. *)
|
|
_advance_token(2);
|
|
_write_c('\n');
|
|
end;
|
|
|
|
proc _compile_var_part();
|
|
begin
|
|
if _memcmp(source_code_position, "var\0", 3) <> 0 then
|
|
goto .compile_var_part_end;
|
|
end;
|
|
(* Skip "var" and newline. *)
|
|
_advance_token(4);
|
|
_write_z(".section .data\n\0");
|
|
|
|
.compile_var_part_loop;
|
|
_skip_empty_lines();
|
|
v0 := _load_byte(source_code_position);
|
|
|
|
if v0 = '\t' then
|
|
_advance_token(1);
|
|
_compile_variable_declaration();
|
|
goto .compile_var_part_loop;
|
|
end;
|
|
|
|
.compile_var_part_end;
|
|
end;
|
|
|
|
(* Process the source code and print the generated code. *)
|
|
proc _compile_module();
|
|
begin
|
|
_compile_const_part();
|
|
_skip_empty_lines();
|
|
_compile_var_part();
|
|
|
|
_write_z(".section .text\n\n\0");
|
|
_write_z(".type _syscall, @function\n_syscall:\n\tmv a7, a6\n\tecall\n\tret\n\n\0");
|
|
_write_z(".type _load_byte, @function\n_load_byte:\n\tlb a0, (a0)\nret\n\n\0");
|
|
_write_z(".type _load_word, @function\n_load_word:\n\tlw a0, (a0)\nret\n\n\0");
|
|
_write_z(".type _store_byte, @function\n_store_byte:\n\tsb a0, (a1)\nret\n\n\0");
|
|
_write_z(".type _store_word, @function\n_store_word:\n\tsw a0, (a1)\nret\n\n\0");
|
|
|
|
.compile_module_loop;
|
|
_skip_empty_lines();
|
|
|
|
if _load_byte(source_code_position) <> 0 then
|
|
(* 5 is "proc " length. Space is needed to distinguish from "procedure". *)
|
|
if _memcmp(source_code_position, "proc ", 5) = 0 then
|
|
_compile_procedure();
|
|
goto .compile_module_loop;
|
|
end;
|
|
end;
|
|
.compile_module_end;
|
|
end;
|
|
|
|
proc _compile();
|
|
begin
|
|
_write_z(".globl _start\n\n\0");
|
|
_compile_module();
|
|
|
|
_write_z(".section .rodata\n.type strings, @object\nstrings: .ascii \0");
|
|
_write_c('"');
|
|
|
|
v0 := @compiler_strings;
|
|
v4 := compiler_strings_position;
|
|
|
|
.compile_loop;
|
|
if v0 < v4 then
|
|
v8 := _load_byte(v0);
|
|
v0 := v0 + 1;
|
|
_write_c(v8);
|
|
|
|
goto .compile_loop;
|
|
end;
|
|
_write_c('"');
|
|
_write_c('\n');
|
|
end;
|
|
|
|
(* Terminates the program. a0 contains the return code. *)
|
|
|
|
(* Parameters: *)
|
|
(* a0 - Status code. *)
|
|
proc _exit();
|
|
begin
|
|
_syscall(0, 0, 0, 0, 0, 0, 93);
|
|
end;
|
|
|
|
(* Inserts a symbol into the table. *)
|
|
|
|
(* Parameters: *)
|
|
(* a0 - Symbol pointer. *)
|
|
(* a1 - Symbol name length. *)
|
|
(* a2 - Symbol name pointer. *)
|
|
(* a3 - Symbol table. *)
|
|
proc _symbol_table_enter();
|
|
begin
|
|
(* The first word in the symbol table is its length, get it. *)
|
|
v0 := _load_word(v76);
|
|
|
|
(* Calculate the offset for the new symbol. *)
|
|
v4 := v0 * 4;
|
|
v4 := v4 + 4;
|
|
v4 := v76 + 4;
|
|
|
|
_memcpy(v4, @v80, 12);
|
|
|
|
(* Increment the symbol table length. *)
|
|
v0 := v0 + 1;
|
|
_store_word(v0, v76);
|
|
end;
|
|
|
|
proc _symbol_table_build();
|
|
begin
|
|
_symbol_table_enter(@symbol_type_info_int, 3, symbol_builtin_name_int, @symbol_table_global);
|
|
_symbol_table_enter(@symbol_type_info_word, 4, symbol_builtin_name_word, @symbol_table_global);
|
|
_symbol_table_enter(@symbol_type_info_pointer, 7, symbol_builtin_name_pointer, @symbol_table_global);
|
|
_symbol_table_enter(@symbol_type_info_char, 4, symbol_builtin_name_char, @symbol_table_global);
|
|
_symbol_table_enter(@symbol_type_info_bool, 4, symbol_builtin_name_bool, @symbol_table_global);
|
|
end;
|
|
|
|
|
|
(* Classification table assigns each possible character to a group (class). All *)
|
|
(* characters of the same group a handled equivalently. *)
|
|
|
|
(* Classification: *)
|
|
|
|
(* TransitionClass = ( *)
|
|
(* transitionClassInvalid = 1, *)
|
|
(* transitionClassDigit = 2, *)
|
|
(* transitionClassAlpha = 3, *)
|
|
(* transitionClassSpace = 4, *)
|
|
(* transitionClassColon = 5, *)
|
|
(* transitionClassEquals = 6, *)
|
|
(* transitionClassLeftParen = 7, *)
|
|
(* transitionClassRightParen = 8, *)
|
|
(* transitionClassAsterisk = 9, *)
|
|
(* transitionClassUnderscore = 10, *)
|
|
(* transitionClassSingle = 11, *)
|
|
(* transitionClassHex = 12, *)
|
|
(* transitionClassZero = 13, *)
|
|
(* transitionClassX = 14, *)
|
|
(* transitionClassEof = 15, *)
|
|
(* transitionClassDot = 16, *)
|
|
(* transitionClassMinus = 17, *)
|
|
(* transitionClassSingleQuote = 18, *)
|
|
(* transitionClassDoubleQuote = 19, *)
|
|
(* transitionClassGreater = 20, *)
|
|
(* transitionClassLess = 21, *)
|
|
(* transitionClassOther = 22 *)
|
|
(* ); *)
|
|
(* TransitionState = ( *)
|
|
(* transitionStateStart = 1, *)
|
|
(* transitionStateColon = 2, *)
|
|
(* transitionStateIdentifier = 3, *)
|
|
(* transitionStateDecimal = 4, *)
|
|
(* transitionStateGreater = 5, *)
|
|
(* transitionStateMinus = 6, *)
|
|
(* transitionStateLeftParen = 7, *)
|
|
(* transitionStateLess = 8, *)
|
|
(* transitionStateDot = 9, *)
|
|
(* transitionStateComment = 10, *)
|
|
(* transitionStateClosingComment = 11, *)
|
|
(* transitionStateCharacter = 12, *)
|
|
(* transitionStateString = 13, *)
|
|
(* transitionStateLeadingZero = 14, *)
|
|
(* transitionStateDecimalSuffix = 15, *)
|
|
(* transitionStateEnd = 16 *)
|
|
(* ); *)
|
|
(* Transition = record *)
|
|
(* action: TransitionAction; *)
|
|
(* next_state: TransitionState *)
|
|
(* end; *)
|
|
(* TransitionAction = ( *)
|
|
(* none = 1, *)
|
|
(* accumulate = 2, *)
|
|
(* skip = 3, *)
|
|
(* single = 4, *)
|
|
(* eof = 5, *)
|
|
(* finalize = 6, *)
|
|
(* composite = 7, *)
|
|
(* key_id = 8, *)
|
|
(* integer = 9, *)
|
|
(* delimited = 10 *)
|
|
(* ); *)
|
|
|
|
(* Assigns some value to at array index. *)
|
|
|
|
(* Parameters: *)
|
|
(* a0 - Array pointer. *)
|
|
(* a1 - Index (word offset into the array). *)
|
|
(* a2 - Data to assign. *)
|
|
proc _assign_at();
|
|
begin
|
|
v0 := v84 + -1;
|
|
v0 := v0 * 4;
|
|
v0 := v88 + v0;
|
|
|
|
_store_word(v80, v0);
|
|
end;
|
|
|
|
proc _create_classification();
|
|
begin
|
|
_assign_at(@classification, 1, 15);
|
|
_assign_at(@classification, 2, 1);
|
|
_assign_at(@classification, 3, 1);
|
|
_assign_at(@classification, 4, 1);
|
|
_assign_at(@classification, 5, 1);
|
|
_assign_at(@classification, 6, 1);
|
|
_assign_at(@classification, 7, 1);
|
|
_assign_at(@classification, 8, 1);
|
|
_assign_at(@classification, 9, 1);
|
|
_assign_at(@classification, 10, 4);
|
|
_assign_at(@classification, 11, 4);
|
|
_assign_at(@classification, 12, 1);
|
|
_assign_at(@classification, 13, 1);
|
|
_assign_at(@classification, 14, 4);
|
|
_assign_at(@classification, 15, 1);
|
|
_assign_at(@classification, 16, 1);
|
|
_assign_at(@classification, 17, 1);
|
|
_assign_at(@classification, 18, 1);
|
|
_assign_at(@classification, 19, 1);
|
|
_assign_at(@classification, 20, 1);
|
|
_assign_at(@classification, 21, 1);
|
|
_assign_at(@classification, 22, 1);
|
|
_assign_at(@classification, 23, 1);
|
|
_assign_at(@classification, 24, 1);
|
|
_assign_at(@classification, 25, 1);
|
|
_assign_at(@classification, 26, 1);
|
|
_assign_at(@classification, 27, 1);
|
|
_assign_at(@classification, 28, 1);
|
|
_assign_at(@classification, 29, 1);
|
|
_assign_at(@classification, 30, 1);
|
|
_assign_at(@classification, 31, 1);
|
|
_assign_at(@classification, 32, 1);
|
|
_assign_at(@classification, 33, 4);
|
|
_assign_at(@classification, 34, 11);
|
|
_assign_at(@classification, 35, 19);
|
|
_assign_at(@classification, 36, 22);
|
|
_assign_at(@classification, 37, 22);
|
|
_assign_at(@classification, 38, 11);
|
|
_assign_at(@classification, 39, 11);
|
|
_assign_at(@classification, 40, 18);
|
|
_assign_at(@classification, 41, 7);
|
|
_assign_at(@classification, 42, 8);
|
|
_assign_at(@classification, 43, 9);
|
|
_assign_at(@classification, 44, 11);
|
|
_assign_at(@classification, 45, 11);
|
|
_assign_at(@classification, 46, 17);
|
|
_assign_at(@classification, 47, 16);
|
|
_assign_at(@classification, 48, 11);
|
|
_assign_at(@classification, 49, 13);
|
|
_assign_at(@classification, 50, 2);
|
|
_assign_at(@classification, 51, 2);
|
|
_assign_at(@classification, 52, 2);
|
|
_assign_at(@classification, 53, 2);
|
|
_assign_at(@classification, 54, 2);
|
|
_assign_at(@classification, 55, 2);
|
|
_assign_at(@classification, 56, 2);
|
|
_assign_at(@classification, 57, 2);
|
|
_assign_at(@classification, 58, 2);
|
|
_assign_at(@classification, 59, 5);
|
|
_assign_at(@classification, 60, 11);
|
|
_assign_at(@classification, 61, 21);
|
|
_assign_at(@classification, 62, 6);
|
|
_assign_at(@classification, 63, 20);
|
|
_assign_at(@classification, 64, 22);
|
|
_assign_at(@classification, 65, 11);
|
|
_assign_at(@classification, 66, 3);
|
|
_assign_at(@classification, 67, 3);
|
|
_assign_at(@classification, 68, 3);
|
|
_assign_at(@classification, 69, 3);
|
|
_assign_at(@classification, 70, 3);
|
|
_assign_at(@classification, 71, 3);
|
|
_assign_at(@classification, 72, 3);
|
|
_assign_at(@classification, 73, 3);
|
|
_assign_at(@classification, 74, 3);
|
|
_assign_at(@classification, 75, 3);
|
|
_assign_at(@classification, 76, 3);
|
|
_assign_at(@classification, 77, 3);
|
|
_assign_at(@classification, 78, 3);
|
|
_assign_at(@classification, 79, 3);
|
|
_assign_at(@classification, 80, 3);
|
|
_assign_at(@classification, 81, 3);
|
|
_assign_at(@classification, 82, 3);
|
|
_assign_at(@classification, 83, 3);
|
|
_assign_at(@classification, 84, 3);
|
|
_assign_at(@classification, 85, 3);
|
|
_assign_at(@classification, 86, 3);
|
|
_assign_at(@classification, 87, 3);
|
|
_assign_at(@classification, 88, 3);
|
|
_assign_at(@classification, 89, 3);
|
|
_assign_at(@classification, 90, 3);
|
|
_assign_at(@classification, 91, 3);
|
|
_assign_at(@classification, 92, 11);
|
|
_assign_at(@classification, 93, 22);
|
|
_assign_at(@classification, 94, 11);
|
|
_assign_at(@classification, 95, 11);
|
|
_assign_at(@classification, 96, 10);
|
|
_assign_at(@classification, 97, 22);
|
|
_assign_at(@classification, 98, 12);
|
|
_assign_at(@classification, 99, 12);
|
|
_assign_at(@classification, 100, 12);
|
|
_assign_at(@classification, 101, 12);
|
|
_assign_at(@classification, 102, 12);
|
|
_assign_at(@classification, 103, 12);
|
|
_assign_at(@classification, 104, 3);
|
|
_assign_at(@classification, 105, 3);
|
|
_assign_at(@classification, 106, 3);
|
|
_assign_at(@classification, 107, 3);
|
|
_assign_at(@classification, 108, 3);
|
|
_assign_at(@classification, 109, 3);
|
|
_assign_at(@classification, 110, 3);
|
|
_assign_at(@classification, 111, 3);
|
|
_assign_at(@classification, 112, 3);
|
|
_assign_at(@classification, 113, 3);
|
|
_assign_at(@classification, 114, 3);
|
|
_assign_at(@classification, 115, 3);
|
|
_assign_at(@classification, 116, 3);
|
|
_assign_at(@classification, 117, 3);
|
|
_assign_at(@classification, 118, 3);
|
|
_assign_at(@classification, 119, 3);
|
|
_assign_at(@classification, 120, 3);
|
|
_assign_at(@classification, 121, 14);
|
|
_assign_at(@classification, 122, 3);
|
|
_assign_at(@classification, 123, 3);
|
|
_assign_at(@classification, 124, 22);
|
|
_assign_at(@classification, 125, 11);
|
|
_assign_at(@classification, 126, 22);
|
|
_assign_at(@classification, 127, 11);
|
|
_assign_at(@classification, 128, 1);
|
|
|
|
v0 := 129;
|
|
|
|
(* Set the remaining 129 - 256 bytes to transitionClassOther. *)
|
|
.create_classification_loop;
|
|
_assign_at(@classification, v0, 22);
|
|
v0 := v0 + 1;
|
|
|
|
if v0 < 257 then
|
|
goto .create_classification_loop;
|
|
end;
|
|
end;
|
|
|
|
(* Parameters: *)
|
|
(* a0 - Current state (first index into transitions table). *)
|
|
(* a1 - Transition (second index into transitions table).. *)
|
|
(* a2 - Action to assign. *)
|
|
(* a3 - Next state to assign. *)
|
|
proc _set_transition();
|
|
begin
|
|
(* Transitions start at offset in classification array. Save the transitions start in v0. *)
|
|
v0 := @classification + 256
|
|
|
|
(* Each state is 8 bytes long (2 words: action and next state). *)
|
|
(* There are 16 transition classes, so a transition 8 * 16 = 128 bytes long. *)
|
|
|
|
v4 := v88 + -1;
|
|
v4 := v4 * 128;
|
|
|
|
v8 := v84 + -1;
|
|
v8 := v8 * 8;
|
|
|
|
v12 := v0 + v4;
|
|
v12 := v12 + v8;
|
|
|
|
_store_word(v80, v12);
|
|
v12 := v12 + 4;
|
|
_store_word(v76, v12);
|
|
end;
|
|
|
|
(* Parameters: *)
|
|
(* a0 - Current state (Transition state enumeration). *)
|
|
(* a1 - Default action (Callback). *)
|
|
(* a2 - Next state (Transition state enumeration). *)
|
|
proc _set_default_transition();
|
|
begin
|
|
_set_transition(v88, 1, v84, v80);
|
|
_set_transition(v88, 2, v84, v80);
|
|
_set_transition(v88, 3, v84, v80);
|
|
_set_transition(v88, 4, v84, v80);
|
|
_set_transition(v88, 5, v84, v80);
|
|
_set_transition(v88, 6, v84, v80);
|
|
_set_transition(v88, 7, v84, v80);
|
|
_set_transition(v88, 8, v84, v80);
|
|
_set_transition(v88, 9, v84, v80);
|
|
_set_transition(v88, 10, v84, v80);
|
|
_set_transition(v88, 11, v84, v80);
|
|
_set_transition(v88, 12, v84, v80);
|
|
_set_transition(v88, 13, v84, v80);
|
|
_set_transition(v88, 14, v84, v80);
|
|
_set_transition(v88, 15, v84, v80);
|
|
_set_transition(v88, 16, v84, v80);
|
|
_set_transition(v88, 17, v84, v80);
|
|
_set_transition(v88, 18, v84, v80);
|
|
_set_transition(v88, 19, v84, v80);
|
|
_set_transition(v88, 20, v84, v80);
|
|
_set_transition(v88, 21, v84, v80);
|
|
_set_transition(v88, 22, v84, v80);
|
|
end;
|
|
|
|
|
|
(* The transition table describes transitions from one state to another, given *)
|
|
(* a symbol (character class). *)
|
|
|
|
(* The table has m rows and n columns, where m is the amount of states and n is *)
|
|
(* the amount of classes. So given the current state and a classified character *)
|
|
(* the table can be used to look up the next state. *)
|
|
|
|
(* Each cell is a word long. *)
|
|
(* - The least significant byte of the word is a row number (beginning with 0). *)
|
|
(* It specifies the target state. "ff" means that this is an end state and no *)
|
|
(* transition is possible. *)
|
|
(* - The next byte is the action that should be performed when transitioning. *)
|
|
(* For the meaning of actions see labels in the lex_next function, which *)
|
|
(* handles each action. *)
|
|
proc _create_transitions();
|
|
begin
|
|
(* Start state. *)
|
|
_set_transition(1, 1, 1, 16);
|
|
_set_transition(1, 2, 2, 4);
|
|
_set_transition(1, 3, 2, 3);
|
|
_set_transition(1, 4, 3, 1);
|
|
_set_transition(1, 5, 2, 5);
|
|
_set_transition(1, 6, 4, 16);
|
|
_set_transition(1, 7, 2, 7);
|
|
_set_transition(1, 8, 4, 16);
|
|
_set_transition(1, 9, 4, 16);
|
|
_set_transition(1, 10, 2, 3);
|
|
_set_transition(1, 11, 4, 16);
|
|
_set_transition(1, 12, 2, 3);
|
|
_set_transition(1, 13, 2, 14);
|
|
_set_transition(1, 14, 2, 3);
|
|
_set_transition(1, 15, 5, 16);
|
|
_set_transition(1, 16, 2, 9);
|
|
_set_transition(1, 17, 2, 6);
|
|
_set_transition(1, 18, 2, 12);
|
|
_set_transition(1, 19, 2, 13);
|
|
_set_transition(1, 20, 2, 5);
|
|
_set_transition(1, 21, 2, 8);
|
|
_set_transition(1, 22, 1, 16);
|
|
|
|
(* Colon state. *)
|
|
_set_default_transition(2, 6, 16);
|
|
_set_transition(2, 6, 7, 16);
|
|
|
|
(* Identifier state. *)
|
|
_set_default_transition(3, 8, 16);
|
|
_set_transition(3, 2, 2, 3);
|
|
_set_transition(3, 3, 2, 3);
|
|
_set_transition(3, 10, 2, 3);
|
|
_set_transition(3, 12, 2, 3);
|
|
_set_transition(3, 13, 2, 3);
|
|
_set_transition(3, 14, 2, 3);
|
|
|
|
(* Decimal state. *)
|
|
_set_default_transition(4, 9, 16);
|
|
_set_transition(4, 2, 2, 4);
|
|
_set_transition(4, 3, 2, 15);
|
|
_set_transition(4, 10, 1, 16);
|
|
_set_transition(4, 12, 2, 15);
|
|
_set_transition(4, 13, 2, 4);
|
|
_set_transition(4, 14, 2, 15);
|
|
|
|
(* Greater state. *)
|
|
_set_default_transition(5, 6, 16);
|
|
_set_transition(5, 6, 7, 16);
|
|
|
|
(* Minus state. *)
|
|
_set_default_transition(6, 6, 16);
|
|
_set_transition(6, 20, 7, 16);
|
|
|
|
(* Left paren state. *)
|
|
_set_default_transition(7, 6, 16);
|
|
_set_transition(7, 9, 2, 10);
|
|
|
|
(* Less state. *)
|
|
_set_default_transition(8, 6, 16);
|
|
_set_transition(8, 6, 7, 16);
|
|
_set_transition(8, 20, 7, 16);
|
|
|
|
(* Hexadecimal after 0x. *)
|
|
_set_default_transition(9, 6, 16);
|
|
_set_transition(9, 16, 7, 16);
|
|
|
|
(* Comment. *)
|
|
_set_default_transition(10, 2, 10);
|
|
_set_transition(10, 9, 2, 11);
|
|
_set_transition(10, 15, 1, 16);
|
|
|
|
(* Closing comment. *)
|
|
_set_default_transition(11, 2, 10);
|
|
_set_transition(11, 1, 1, 16);
|
|
_set_transition(11, 8, 10, 16);
|
|
_set_transition(11, 9, 2, 11);
|
|
_set_transition(11, 15, 1, 16);
|
|
|
|
(* Character. *)
|
|
_set_default_transition(12, 2, 12);
|
|
_set_transition(12, 1, 1, 16);
|
|
_set_transition(12, 15, 1, 16);
|
|
_set_transition(12, 18, 10, 16);
|
|
|
|
(* String. *)
|
|
_set_default_transition(13, 2, 13);
|
|
_set_transition(13, 1, 1, 16);
|
|
_set_transition(13, 15, 1, 16);
|
|
_set_transition(13, 19, 10, 16);
|
|
|
|
(* Leading zero. *)
|
|
_set_default_transition(14, 9, 16);
|
|
_set_transition(14, 2, 1, 16);
|
|
_set_transition(14, 3, 1, 16);
|
|
_set_transition(14, 10, 1, 16);
|
|
_set_transition(14, 12, 1, 16);
|
|
_set_transition(14, 13, 1, 16);
|
|
_set_transition(14, 14, 1, 16);
|
|
|
|
(* Digit with a character suffix. *)
|
|
_set_default_transition(15, 9, 16);
|
|
_set_transition(15, 3, 1, 16);
|
|
_set_transition(15, 2, 1, 16);
|
|
_set_transition(15, 12, 1, 16);
|
|
_set_transition(15, 13, 1, 16);
|
|
_set_transition(15, 14, 1, 16);
|
|
end;
|
|
|
|
proc _lexer_get_state();
|
|
begin
|
|
(* Lexer state is saved after the transition tables. The offset is 256 + 16 * 22. *)
|
|
v0 := @classification;
|
|
v4 := 16 * 22;
|
|
v0 := v0 + 256;
|
|
|
|
return v0 + v4
|
|
end;
|
|
|
|
(* Gets pointer to the current source text. *)
|
|
proc _lexer_get_current();
|
|
begin
|
|
return _lexer_get_state() + 4
|
|
end;
|
|
|
|
(* Resets the lexer state for reading the next token. *)
|
|
proc _lexer_reset();
|
|
begin
|
|
(* Transition start state is 1. *)
|
|
v0 := _lexer_get_state();
|
|
_store_word(1, v4);
|
|
|
|
(* Text pointer to the beginning of the currently read token. *)
|
|
v4 := _lexer_get_current();
|
|
_store_word(source_code_position, v4);
|
|
|
|
(* Initial length of the token is 0. *)
|
|
_store_word(0, source_code_position + 4);
|
|
end;
|
|
|
|
(* One time lexer initialization. *)
|
|
proc _lexer_initialize();
|
|
begin
|
|
_create_classification();
|
|
_create_transitions();
|
|
end;
|
|
|
|
(* Entry point. *)
|
|
proc _start();
|
|
begin
|
|
_lexer_initialize();
|
|
_symbol_table_build();
|
|
|
|
(* Read the source from the standard input. *)
|
|
(* Second argument is buffer size. Modifying update the source_code definition. *)
|
|
_read_file(@source_code, 81920);
|
|
_compile();
|
|
|
|
_exit(0);
|
|
end;
|