Move stages into subdirectories

1 files changed, 0 insertions, 1588 deletions

diff --git a/boot/stage6.elna b/boot/stage6.elna
deleted file mode 100644
index 7d426f9..0000000
--- a/boot/stage6.elna
+++ /dev/null
@@ -1,1588 +0,0 @@
-# This Source Code Form is subject to the terms of the Mozilla Public License,
-# v. 2.0. If a copy of the MPL was not distributed with this file, You can
-# obtain one at https://mozilla.org/MPL/2.0/.
-
-# Stage 6 compiler.
-#
-# - String literals.
-
-.section .rodata
-
-.type keyword_section, @object
-keyword_section: .ascii ".section"
-
-.type keyword_type, @object
-keyword_type: .ascii ".type"
-
-.type keyword_ret, @object
-keyword_ret: .ascii "\tret"
-
-.type keyword_global, @object
-keyword_global: .ascii ".globl"
-
-.type keyword_proc, @object
-keyword_proc: .ascii "proc "
-
-.type keyword_end, @object
-keyword_end: .ascii "end"
-
-.type keyword_begin, @object
-keyword_begin: .ascii "begin"
-
-.type keyword_var, @object
-keyword_var: .ascii "var"
-
-.type asm_prologue, @object
-asm_prologue: .string "\taddi sp, sp, -128\n\tsw ra, 124(sp)\n\tsw s0, 120(sp)\n\taddi s0, sp, 128\n"
-
-.type asm_epilogue, @object
-asm_epilogue: .string "\tlw ra, 124(sp)\n\tlw s0, 120(sp)\n\taddi sp, sp, 128\n\tret\n"
-
-.type asm_type_directive, @object
-asm_type_directive: .string ".type "
-
-.type asm_type_function, @object
-asm_type_function: .string ", @function\n"
-
-.type asm_type_object, @object
-asm_type_object: .string ", @object\n"
-
-.type asm_colon, @object
-asm_colon: .string ":\n"
-
-.type asm_call, @object
-asm_call: .string "\tcall "
-
-.type asm_j, @object
-asm_j: .string "\tj "
-
-.type asm_li, @object
-asm_li: .string "\tli "
-
-.type asm_lw, @object
-asm_lw: .string "\tlw "
-
-.type asm_la, @object
-asm_la: .string "\tla "
-
-.type asm_sw, @object
-asm_sw: .string "\tsw "
-
-.type asm_addi, @object
-asm_addi: .string "\taddi "
-
-.type asm_add, @object
-asm_add: .string "\tadd "
-
-.type asm_mul, @object
-asm_mul: .string "\tmul "
-
-.type asm_neg, @object
-asm_neg: .string "\tneg "
-
-.type asm_not, @object
-asm_not: .string "\tnot "
-
-.type asm_and, @object
-asm_and: .string "\tand "
-
-.type asm_or, @object
-asm_or: .string "\tor "
-
-.type asm_xor, @object
-asm_xor: .string "\txor "
-
-.type asm_xori, @object
-asm_xori: .string "\txori "
-
-.type asm_sub, @object
-asm_sub: .string "\tsub "
-
-.type asm_seqz, @object
-asm_seqz: .string "\tseqz "
-
-.type asm_snez, @object
-asm_snez: .string "\tsnez "
-
-.type asm_slt, @object
-asm_slt: .string "\tslt "
-
-.type asm_mv, @object
-asm_mv: .string "\tmv "
-
-.type asm_comma, @object
-asm_comma: .string ", "
-
-.type asm_sp, @object
-asm_sp: .string "sp"
-
-.type asm_rodata, @object
-asm_rodata: .string ".section .rodata\n"
-
-.type asm_strings, @object
-asm_strings: .string "strings"
-
-.type asm_ascii, @object
-asm_ascii: .string " .ascii "
-
-.section .bss
-
-# When modifiying also change the read size in the entry point procedure.
-.type source_code, @object
-source_code: .zero 81920
-
-.type compiler_strings, @object
-compiler_strings: .zero 8192
-
-.section .data
-
-.type compiler_strings_position, @object
-compiler_strings_position: .word compiler_strings
-
-.type compiler_strings_length, @object
-compiler_strings_length: .word 0
-
-.type source_code_position, @object
-source_code_position: .word source_code
-
-.section .text
-
-# Calculates and returns the string token length between quotes, including the
-# escaping slash characters.
-#
-# Parameters:
-# a0 - String token pointer.
-#
-# Returns the length in a0.
-proc _string_length();
-begin
-	# Reset the counter.
-	v0 := 0;
-
-.string_length_loop:
-	v88 := v88 + 1;
-
-	lw t0, 88(sp)
-	lb t0, (t0)
-
-	li t1, '"'
-	beq t0, t1, .string_length_end
-
-	v0 := v0 + 1;
-	goto .string_length_loop;
-
-.string_length_end:
-	return v0
-end;
-
-# Adds a string to the global, read-only string storage.
-#
-# Parameters:
-# a0 - String token.
-#
-# Returns the offset from the beginning of the storage to the new string in a0.
-proc _add_string();
-begin
-	v0 := v88 + 1;
-	v4 := compiler_strings_length;
-
-.add_string_loop:
-	lw t0, 0(sp)
-	lb t1, (t0)
-	li t2, '"'
-
-	beq t1, t2, .add_string_end
-
-	la t2, compiler_strings_position
-	lw t3, (t2)
-	sb t1, (t3)
-
-	addi t3, t3, 1
-	sw t3, (t2)
-
-	addi t0, t0, 1
-	sw t0, 0(sp)
-
-	li t2, '\\'
-	bne t1, t2, .add_string_increment
-
-	goto .add_string_loop;
-
-.add_string_increment:
-	la t2, compiler_strings_length
-	lw t4, (t2)
-	addi t4, t4, 1
-	sw t4, (t2)
-
-	goto .add_string_loop;
-
-.add_string_end:
-	return v4
-end;
-
-# Reads standard input into a buffer.
-# a0 - Buffer pointer.
-# a1 - Buffer size.
-#
-# Returns the amount of bytes written in a0.
-proc _read_file();
-begin
-	mv a2, a1
-	mv a1, a0
-	# STDIN.
-	li a0, 0
-	li a7, 63 # SYS_READ.
-	ecall
-end;
-
-# Writes to the standard output.
-#
-# Parameters:
-# a0 - Buffer.
-# a1 - Buffer length.
-proc _write_s();
-begin
-	mv a2, a1
-	mv a1, a0
-	# STDOUT.
-	li a0, 1
-	li a7, 64 # SYS_WRITE.
-	ecall
-end;
-
-# Writes a number to a string buffer.
-#
-# t0 - Local buffer.
-# t1 - Constant 10.
-# t2 - Current character.
-# t3 - Whether the number is negative.
-#
-# Parameters:
-# a0 - Whole number.
-# a1 - Buffer pointer.
-#
-# Sets a0 to the length of the written number.
-proc _print_i();
-begin
-	li t1, 10
-	addi t0, s0, -9
-
-	li t3, 0
-	bgez a0, .print_i_digit10
-	li t3, 1
-	neg a0, a0
-
-.print_i_digit10:
-	rem t2, a0, t1
-	addi t2, t2, '0'
-	sb t2, 0(t0)
-	div a0, a0, t1
-	addi t0, t0, -1
-	bne zero, a0, .print_i_digit10
-
-	beq zero, t3, .print_i_write_call
-	addi t2, zero, '-'
-	sb t2, 0(t0)
-	addi t0, t0, -1
-
-.print_i_write_call:
-	mv a0, a1
-	addi a1, t0, 1
-	sub a2, s0, t0
-	addi a2, a2, -9
-	sw a2, 0(sp)
-
-	_memcpy();
-
-	return v0
-end;
-
-# Writes a number to the standard output.
-#
-# Parameters:
-# a0 - Whole number.
-proc _write_i();
-begin
-	_print_i(v88, @v0);
-
-	mv a1, a0
-	addi a0, sp, 0
-	_write_s();
-
-end;
-
-# Writes a character from a0 into the standard output.
-proc _write_c();
-begin
-	_write_s(@v88, 1);
-end;
-
-# Write null terminated string.
-#
-# Parameters:
-# a0 - String.
-proc _write_z();
-begin
-.write_z_loop:
-	# Check for 0 character.
-	lw a0, 88(sp)
-	lb a0, (a0)
-	beqz a0, .write_z_end
-
-	# Print a character.
-	_write_c();
-
-	# Advance the input string by one byte.
-	v88 := v88 + 1;
-
-	goto .write_z_loop;
-
-.write_z_end:
-end;
-
-# Detects if a0 is an uppercase character. Sets a0 to 1 if so, otherwise to 0.
-proc _is_upper();
-begin
-	v0 := v88 >= 'A';
-	v4 := v88 <= 'Z';
-
-	return v0 & v4
-
-end;
-
-# Detects if a0 is an lowercase character. Sets a0 to 1 if so, otherwise to 0.
-proc _is_lower();
-begin
-	v0 := v88 >= 'a';
-	v4 := v88 <= 'z';
-
-	return v0 & v4
-
-end;
-
-# Detects if the passed character is a 7-bit alpha character or an underscore.
-#
-# Paramters:
-# a0 - Tested character.
-#
-# Sets a0 to 1 if the character is an alpha character or underscore, sets it to 0 otherwise.
-proc _is_alpha();
-begin
-	sw a0, 0(sp)
-
-	_is_upper();
-	sw a0, 4(sp)
-
-	_is_lower(v0);
-
-	lw t0, 0(sp)
-	xori t1, t0, '_'
-	seqz t1, t1
-
-	lw t0, 4(sp)
-	or a0, a0, t0
-	or a0, a0, t1
-end;
-
-# Detects whether the passed character is a digit
-# (a value between 0 and 9).
-#
-# Parameters:
-# a0 - Exemined value.
-#
-# Sets a0 to 1 if it is a digit, to 0 otherwise.
-proc _is_digit();
-begin
-	v0 := v88 >= '0';
-	v4 := v88 <= '9';
-
-	return v0 & v4
-end;
-
-proc _is_alnum();
-begin
-	sw a0, 4(sp)
-
-	_is_alpha();
-	sw a0, 0(sp)
-
-	_is_digit(v4);
-
-	lw a1, 0(sp)
-	or a0, a0, a1
-end;
-
-# Reads the next token.
-#
-# Returns token length in a0.
-proc _read_token();
-begin
-	# Current token position.
-	v0 := source_code_position;
-	# Token length.
-	v4 := 0;
-
-.read_token_loop:
-	lw t0, 0(sp)
-	lb t0, (t0) # Current character.
-
-	# First we try to read a derictive.
-	# A derictive can contain a dot and characters.
-	li t1, '.'
-	beq t0, t1, .read_token_next
-
-	lw a0, 0(sp)
-	lb a0, (a0)
-	_is_alnum();
-	bnez a0, .read_token_next
-
-	goto .read_token_end;
-
-.read_token_next:
-	# Advance the source code position and token length.
-	v4 := v4 + 1;
-	v0 := v0 + 1;
-
-	goto .read_token_loop;
-
-.read_token_end:
-	return v4
-end;
-
-# a0 - First pointer.
-# a1 - Second pointer.
-# a2 - The length to compare.
-#
-# Returns 0 in a0 if memory regions are equal.
-proc _memcmp();
-begin
-	mv t0, a0
-	li a0, 0
-
-.memcmp_loop:
-	beqz a2, .memcmp_end
-
-	lbu t1, (t0)
-	lbu t2, (a1)
-	sub a0, t1, t2
-
-	bnez a0, .memcmp_end
-
-	addi t0, t0, 1
-	addi a1, a1, 1
-	addi a2, a2, -1
-
-	goto .memcmp_loop;
-
-.memcmp_end:
-end;
-
-# Copies memory.
-#
-# Parameters:
-# a0 - Destination.
-# a1 - Source.
-# a2 - Size.
-#
-# Preserves a0.
-proc _memcpy();
-begin
-	mv t0, a0
-
-.memcpy_loop:
-	beqz a2, .memcpy_end
-
-	lbu t1, (a1)
-	sb t1, (a0)
-
-	addi a0, a0, 1
-	addi a1, a1, 1
-	addi a2, a2, -1
-
-	goto .memcpy_loop
-
-.memcpy_end:
-	mv a0, t0
-end;
-
-# Advances the token stream by a0 bytes.
-proc _advance_token();
-begin
-	la t0, source_code_position
-	lw t1, (t0)
-	add t1, t1, a0
-	sw t1, (t0)
-end;
-
-# Prints the current token.
-#
-# Parameters:
-# a0 - Token length.
-#
-# Returns a0 unchanged.
-proc _write_token();
-begin
-	_write_s(source_code_position, v88);
-	return v88
-end;
-
-proc _compile_section();
-begin
-	# Print and skip the ".section" (8 characters) directive and a space after it.
-	_write_token(9);
-	_advance_token();
-
-	# Read the section name.
-	_read_token();
-	addi a0, a0, 1
-
-	_write_token();
-	_advance_token();
-end;
-
-# Prints and skips a line.
-proc _skip_comment();
-begin
-	la t0, source_code_position
-	lw t1, (t0)
-
-.skip_comment_loop:
-	# Check for newline character.
-	lb t2, (t1)
-	li t3, '\n'
-	beq t2, t3, .skip_comment_end
-
-	# Advance the input string by one byte.
-	addi t1, t1, 1
-	sw t1, (t0)
-
-	goto .skip_comment_loop;
-
-.skip_comment_end:
-	# Skip the newline.
-	addi t1, t1, 1
-	sw t1, (t0)
-end;
-
-# Prints and skips a line.
-proc _compile_line();
-begin
-.compile_line_loop:
-	la a0, source_code_position
-	lw a1, (a0)
-
-	lb t0, (a1)
-	li t1, '\n'
-	beq t0, t1, .compile_line_end
-
-	# Print a character.
-	lw a0, (a1)
-	_write_c();
-
-	# Advance the input string by one byte.
-	_advance_token(1);
-
-	goto .compile_line_loop;
-
-.compile_line_end:
-	_write_c('\n');
-
-	_advance_token(1);
-end;
-
-proc _compile_integer_literal();
-begin
-	_write_z(@asm_li);
-	_write_register('t', 0);
-	_write_z(@asm_comma);
-
-	_read_token();
-	_write_token();
-	_advance_token();
-
-	_write_c('\n');
-end;
-
-proc _compile_character_literal();
-begin
-	_write_z(@asm_li);
-	_write_register('t', 0);
-	_write_z(@asm_comma);
-
-	_write_c('\'');
-	_advance_token(1);
-
-	la t0, source_code_position
-	lw t0, (t0)
-	lb a0, (t0)
-	li t1, '\\'
-	bne a0, t1, .compile_character_literal_end
-	
-	_write_c('\\');
-	_advance_token(1);
-
-.compile_character_literal_end:
-	la t0, source_code_position
-	lw t0, (t0)
-	lb a0, (t0)
-	_write_c();
-
-	_write_c('\'');
-	_write_c('\n');
-
-	_advance_token(2);
-
-end;
-
-proc _compile_variable_expression();
-begin
-	_compile_designator();
-
-	_write_z(@asm_lw);
-	_write_register('t', 0);
-	_write_z(@asm_comma);
-
-	_write_c('(');
-	_write_register('t', 0);
-
-	_write_c(')');
-	_write_c('\n');
-
-end;
-
-proc _compile_address_expression();
-begin
-	# Skip the "@" sign.
-	_advance_token(1);
-	_compile_designator();
-
-end;
-
-proc _compile_negate_expression();
-begin
-	# Skip the "-" sign.
-	_advance_token(1);
-	_compile_term();
-
-	_write_z(@asm_neg);
-	_write_register('t', 0);
-
-	_write_z(@asm_comma);
-	_write_register('t', 0);
-
-	_write_c('\n');
-
-end;
-
-proc _compile_not_expression();
-begin
-	# Skip the "~" sign.
-	_advance_token(1);
-	_compile_term();
-
-	_write_z(@asm_not);
-	_write_register('t', 0);
-
-	_write_z(@asm_comma);
-	_write_register('t', 0);
-
-	_write_c('\n');
-
-end;
-
-proc _compile_string_literal();
-begin
-	_string_length(source_code_position);
-	sw a0, 0(sp)
-
-	_add_string(source_code_position);
-	sw a0, 4(sp)
-
-	_advance_token(v0 + 2);
-
-	_write_z(@asm_la);
-	_write_register('t', 0);
-	_write_z(@asm_comma);
-	_write_z(@asm_strings);
-	_write_c('\n');
-
-	_write_z(@asm_li);
-	_write_register('t', 1);
-	_write_z(@asm_comma);
-	_write_i(v4);
-	_write_c('\n');
-
-	_write_z(@asm_add);
-	_write_register('t', 0);
-	_write_z(@asm_comma);
-	_write_register('t', 0);
-	_write_z(@asm_comma);
-	_write_register('t', 1);
-	_write_c('\n');
-end;
-
-proc _compile_term();
-begin
-	la t0, source_code_position
-	lw t0, (t0)
-	lb a0, (t0)
-	sw a0, 0(sp)
-
-	li t1, '\''
-	beq a0, t1, .compile_term_character_literal
-
-	li t1, '@'
-	beq a0, t1, .compile_term_address
-
-	li t1, '-'
-	beq a0, t1, .compile_term_negation
-
-	li t1, '~'
-	beq a0, t1, .compile_term_not
-
-	li t1, '"'
-	beq a0, t1, .compile_term_string_literal
-
-	_is_digit(v0);
-	bnez a0, .compile_term_integer_literal
-
-	goto .compile_term_variable;
-
-.compile_term_character_literal:
-	_compile_character_literal();
-	goto .compile_term_end;
-
-.compile_term_integer_literal:
-	_compile_integer_literal();
-	goto .compile_term_end;
-
-.compile_term_address:
-	_compile_address_expression();
-	goto .compile_term_end;
-
-.compile_term_negation:
-	_compile_negate_expression();
-	goto .compile_term_end;
-
-.compile_term_not:
-	_compile_not_expression();
-	goto .compile_term_end;
-
-.compile_term_string_literal:
-	_compile_string_literal();
-	goto .compile_term_end;
-
-.compile_term_variable:
-	_compile_variable_expression();
-	goto .compile_term_end;
-
-.compile_term_end:
-end;
-
-proc _compile_binary_rhs();
-begin
-	# Skip the whitespace after the binary operator.
-	_advance_token(1);
-	_compile_term();
-
-	# Load the left expression from the stack;
-	_write_z(@asm_lw);
-	_write_register('t', 1);
-	_write_z(@asm_comma);
-	_write_i(24);
-	_write_c('(');
-	_write_z(@asm_sp);
-	_write_c(')');
-	_write_c('\n');
-
-end;
-
-proc _compile_expression();
-begin
-	_compile_term();
-
-	la t0, source_code_position
-	lw t0, (t0)
-	lb a0, (t0)
-
-	li t1, ' '
-	bne a0, t1, .compile_expression_end
-
-	# It is a binary expression.
-
-	# Save the value of the left expression on the stack.
-	_write_z(@asm_sw);
-	_write_register('t', 0);
-	_write_z(@asm_comma);
-	_write_i(24);
-	_write_c('(');
-	_write_z(@asm_sp);
-	_write_c(')');
-	_write_c('\n');
-
-	# Skip surrounding whitespace in front of the operator.
-	_advance_token(1);
-	la t0, source_code_position
-	lw t0, (t0)
-	lb t0, (t0)
-
-	li t1, '+'
-	beq t0, t1, .compile_expression_add
-
-	li t1, '*'
-	beq t0, t1, .compile_expression_mul
-
-	li t1, '&'
-	beq t0, t1, .compile_expression_and
-
-	li t1, 'o'
-	beq t0, t1, .compile_expression_or
-
-	li t1, 'x'
-	beq t0, t1, .compile_expression_xor
-
-	li t1, '='
-	beq t0, t1, .compile_expression_equals
-
-	li t1, '<'
-	beq t0, t1, .compile_expression_less
-
-	li t1, '>'
-	beq t0, t1, .compile_expression_greater
-
-	# Unknown binary operator.
-	unimp
-
-.compile_expression_add:
-	_advance_token(1);
-	_compile_binary_rhs();
-
-	# Execute the operation.
-	_write_z(@asm_add);
-	_write_register('t', 0);
-	_write_z(@asm_comma);
-	_write_register('t', 0);
-	_write_z(@asm_comma);
-	_write_register('t', 1);
-	_write_c('\n');
-
-	goto .compile_expression_end;
-
-.compile_expression_mul:
-	_advance_token(1);
-	_compile_binary_rhs();
-
-	# Execute the operation.
-	_write_z(@asm_mul);
-	_write_register('t', 0);
-	_write_z(@asm_comma);
-	_write_register('t', 0);
-	_write_z(@asm_comma);
-	_write_register('t', 1);
-	_write_c('\n');
-
-	goto .compile_expression_end;
-
-.compile_expression_and:
-	_advance_token(1);
-	_compile_binary_rhs();
-
-	# Execute the operation.
-	_write_z(@asm_and);
-	_write_register('t', 0);
-	_write_z(@asm_comma);
-	_write_register('t', 0);
-	_write_z(@asm_comma);
-	_write_register('t', 1);
-	_write_c('\n');
-
-	goto .compile_expression_end;
-
-.compile_expression_or:
-	_advance_token(2);
-	_compile_binary_rhs();
-
-	# Execute the operation.
-	_write_z(@asm_or);
-	_write_register('t', 0);
-	_write_z(@asm_comma);
-	_write_register('t', 0);
-	_write_z(@asm_comma);
-	_write_register('t', 1);
-	_write_c('\n');
-
-	goto .compile_expression_end;
-
-.compile_expression_xor:
-	_advance_token(3);
-	_compile_binary_rhs();
-
-	# Execute the operation.
-	_write_z(@asm_xor);
-	_write_register('t', 0);
-	_write_z(@asm_comma);
-	_write_register('t', 0);
-	_write_z(@asm_comma);
-	_write_register('t', 1);
-	_write_c('\n');
-
-	goto .compile_expression_end;
-
-.compile_expression_equals:
-	_advance_token(1);
-	_compile_binary_rhs();
-
-	# Execute the operation.
-	_write_z(@asm_xor);
-	_write_register('t', 0);
-	_write_z(@asm_comma);
-	_write_register('t', 0);
-	_write_z(@asm_comma);
-	_write_register('t', 1);
-	_write_c('\n');
-
-	_write_z(@asm_seqz);
-	_write_register('t', 0);
-	_write_z(@asm_comma);
-	_write_register('t', 0);
-	_write_c('\n');
-
-	goto .compile_expression_end;
-
-.compile_expression_less:
-	_advance_token(1);
-	la t0, source_code_position
-	lw t0, (t0)
-	lb t0, (t0)
-
-	li t1, '>'
-	beq t0, t1, .compile_expression_not_equal
-
-	li t1, '='
-	beq t0, t1, .compile_expression_less_equal
-
-	_compile_binary_rhs();
-
-	# Execute the operation.
-	_write_z(@asm_slt);
-	_write_register('t', 0);
-	_write_z(@asm_comma);
-	_write_register('t', 0);
-	_write_z(@asm_comma);
-	_write_register('t', 1);
-	_write_c('\n');
-
-	goto .compile_expression_end;
-
-.compile_expression_not_equal:
-	_advance_token(1);
-	_compile_binary_rhs();
-
-	# Execute the operation.
-	_write_z(@asm_xor);
-	_write_register('t', 0);
-	_write_z(@asm_comma);
-	_write_register('t', 0);
-	_write_z(@asm_comma);
-	_write_register('t', 1);
-	_write_c('\n');
-
-	_write_z(@asm_snez);
-	_write_register('t', 0);
-	_write_z(@asm_comma);
-	_write_register('t', 0);
-	_write_c('\n');
-
-	goto .compile_expression_end;
-
-.compile_expression_less_equal:
-	_advance_token(1);
-	_compile_binary_rhs();
-
-	# Execute the operation.
-	_write_z(@asm_slt);
-	_write_register('t', 0);
-	_write_z(@asm_comma);
-	_write_register('t', 0);
-	_write_z(@asm_comma);
-	_write_register('t', 1);
-	_write_c('\n');
-
-	# Execute the operation.
-	_write_z(@asm_xori);
-	_write_register('t', 0);
-	_write_z(@asm_comma);
-	_write_register('t', 0);
-	_write_z(@asm_comma);
-	_write_i(1);
-	_write_c('\n');
-
-	goto .compile_expression_end;
-
-.compile_expression_greater:
-	_advance_token(1);
-	la t0, source_code_position
-	lw t0, (t0)
-	lb t0, (t0)
-
-	li t1, '='
-	beq t0, t1, .compile_expression_greater_equal
-
-	_compile_binary_rhs();
-
-	# Execute the operation.
-	_write_z(@asm_slt);
-	_write_register('t', 0);
-	_write_z(@asm_comma);
-	_write_register('t', 1);
-	_write_z(@asm_comma);
-	_write_register('t', 0);
-	_write_c('\n');
-
-	goto .compile_expression_end;
-
-.compile_expression_greater_equal:
-	_advance_token(1);
-	_compile_binary_rhs();
-
-	# Execute the operation.
-	_write_z(@asm_slt);
-	_write_register('t', 0);
-	_write_z(@asm_comma);
-	_write_register('t', 1);
-	_write_z(@asm_comma);
-	_write_register('t', 0);
-	_write_c('\n');
-
-	# Execute the operation.
-	_write_z(@asm_xori);
-	_write_register('t', 0);
-	_write_z(@asm_comma);
-	_write_register('t', 0);
-	_write_z(@asm_comma);
-	_write_i(1);
-	_write_c('\n');
-
-	goto .compile_expression_end;
-
-.compile_expression_end:
-end;
-
-proc _compile_call();
-begin
-	# Stack variables:
-	# v0 - Procedure name length.
-	# v4 - Procedure name pointer. 
-	# v8 - Argument count.
-
-	_read_token();
-	sw a0, 0(sp)
-	v4 := source_code_position;
-	v8 := 0;
-
-	# Skip the identifier and left paren.
-	_advance_token(v0 + 1);
-
-	la t0, source_code_position
-	lw t0, (t0)
-	lb t0, (t0)
-
-	li t1, ')'
-	beq t0, t1, .compile_call_finalize
-
-.compile_call_loop:
-	_compile_expression();
-
-	# Save the argument on the stack.
-	_write_z(@asm_sw);
-	_write_register('t', 0);
-	_write_z(@asm_comma);
-
-	# Calculate the stack offset: 116 - (4 * argument_counter)
-	v12 := v8 * 4;
-	v12 := 116 + -v12;
-	_write_i(v12);
-
-	_write_c('(');
-	_write_z(@asm_sp);
-	_write_c(')')
-
-	_write_c('\n');
-
-	# Add one to the argument counter.
-	v8 := v8 + 1;
-
-	la t0, source_code_position
-	lw t0, (t0)
-	lb t0, (t0)
-
-	li t1, ','
-	bne t0, t1, .compile_call_finalize
-
-	_advance_token(2);
-	goto .compile_call_loop;
-
-.compile_call_finalize:
-	# Load the argument from the stack.
-
-	lw t0, 8(sp)
-	beqz t0, .compile_call_end
-
-	# Decrement the argument counter.
-	v8 := v8 + -1;
-
-	_write_z(@asm_lw);
-
-	_write_c('a');
-	_write_i(v8);
-
-	_write_z(@asm_comma);
-
-	# Calculate the stack offset: 116 - (4 * argument_counter)
-	v12 := v8 * 4;
-	v12 := 116 + -v12;
-	_write_i(v12);
-
-	_write_c('(');
-	_write_z(@asm_sp);
-
-	_write_c(')');
-	_write_c('\n');
-
-	goto .compile_call_finalize;
-
-.compile_call_end:
-	_write_z(@asm_call);
-	_write_s(v4, v0);
-
-	# Skip the right paren.
-	_advance_token(1);
-end;
-
-proc _compile_goto();
-begin
-	_advance_token(5);
-
-	_read_token();
-	sw a0, 0(sp)
-
-	_write_z(@asm_j);
-
-	_write_token(v0);
-	_advance_token();
-end;
-
-proc _compile_local_designator();
-begin
-	# Skip "v" in the local variable name.
-	_advance_token(1);
-
-	_write_z(@asm_addi);
-	_write_register('t', 0);
-	_write_z(@asm_comma);
-	_write_z(@asm_sp);
-	_write_z(@asm_comma);
-
-	# Read local variable stack offset and save it.
-	_read_token();
-	_write_token();
-	_advance_token();
-	_write_c('\n');
-
-end;
-
-proc _compile_global_designator();
-begin
-	_write_z(@asm_la);
-	_write_register('t', 0);
-	_write_z(@asm_comma);
-
-	_read_token();
-	_write_token();
-	_advance_token();
-
-	_write_c('\n');
-end;
-
-proc _compile_designator();
-begin
-	la t0, source_code_position
-	lw t0, (t0)
-	lb a0, (t0)
-
-	li t1, 'v'
-	beq a0, t1, .compile_designator_local
-
-	goto .compile_designator_global;
-
-.compile_designator_local:
-	_compile_local_designator();
-	goto .compile_designator_end;
-
-.compile_designator_global:
-	_compile_global_designator();
-	goto .compile_designator_end;
-
-.compile_designator_end:
-end;
-
-proc _compile_assignment();
-begin
-	_compile_designator();
-
-	# Save the assignee address on the stack.
-	_write_z(@asm_sw);
-	_write_register('t', 0);
-	_write_z(@asm_comma);
-
-	_write_i(20);
-	_write_c('(');
-	_write_z(@asm_sp);
-	_write_c(')');
-	_write_c('\n');
-	# Skip the assignment sign (:=) with surrounding whitespaces.
-	_advance_token(4);
-
-	# Compile the assignment.
-	_compile_expression();
-
-	_write_z(@asm_lw);
-	_write_register('t', 1);
-	_write_z(@asm_comma);
-
-	_write_i(20);
-	_write_c('(');
-	_write_z(@asm_sp);
-	_write_c(')');
-	_write_c('\n');
-
-	_write_z(@asm_sw);
-	_write_register('t', 0);
-	_write_z(@asm_comma);
-
-	_write_c('(');
-	_write_register('t', 1);
-	_write_c(')');
-end;
-
-proc _compile_return_statement();
-begin
-	# Skip "return" keyword and whitespace after it.
-	_advance_token(7);
-	_compile_expression();
-
-	_write_z(@asm_mv);
-	_write_register('a', 0);
-	_write_z(@asm_comma);
-	_write_register('t', 0);
-
-end;
-
-proc _compile_statement();
-begin
-	# This is a call if the statement starts with an underscore.
-	la t0, source_code_position
-	lw t0, (t0)
-	# First character after alignment tab.
-	addi t0, t0, 1
-	lb t0, (t0)
-	
-	li t1, '_'
-	beq t0, t1, .compile_statement_call
-
-	li t1, 'g'
-	beq t0, t1, .compile_statement_goto
-
-	li t1, 'v'
-	beq t0, t1, .compile_statement_assignment
-
-	# keyword_ret contains "\tret", so it's 4 bytes long.
-	_memcmp(source_code_position, @keyword_ret, 4);
-	beqz a0, .compile_statement_return
-
-	_compile_line();
-	goto .compile_statement_end;
-
-.compile_statement_call:
-	_advance_token(1);
-	_compile_call();
-
-	goto .compile_statement_semicolon;
-
-.compile_statement_goto:
-	_advance_token(1);
-	_compile_goto();
-
-	goto .compile_statement_semicolon;
-
-.compile_statement_assignment:
-	_advance_token(1);
-	_compile_assignment();
-
-	goto .compile_statement_semicolon;
-
-.compile_statement_return:
-	_advance_token(1);
-	_compile_return_statement();
-	_write_c('\n');
-
-	goto .compile_statement_end;
-
-.compile_statement_semicolon:
-	_advance_token(2);
-	_write_c('\n');
-
-.compile_statement_end:
-end;
-
-proc _compile_procedure_body();
-begin
-.compile_procedure_body_loop:
-	# 3 is "end" length.
-	_memcmp(source_code_position, @keyword_end, 3);
-
-	beqz a0, .compile_procedure_body_epilogue
-
-	_compile_statement();
-	goto .compile_procedure_body_loop;
-
-.compile_procedure_body_epilogue:
-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
-	_write_z(@asm_prologue);
-	v0 := 0;
-
-.compile_procedure_prologue_loop:
-	_write_z(@asm_sw);
-	_write_register('a', v0);
-	_write_z(@asm_comma);
-
-	# Calculate the stack offset: 88 - (4 * parameter_counter)
-	v4 := v0 * 4;
-	v4 := 88 + -v4;
-	_write_i(v4);
-
-	_write_c('(');
-	_write_z(@asm_sp);
-	_write_c(')');
-	_write_c('\n');
-
-	v0 := v0 + 1;
-	lw a0, 0(sp)
-
-	li t0, 8
-	bne a0, t0, .compile_procedure_prologue_loop
-end;
-
-proc _compile_procedure();
-begin
-	# Skip "proc ".
-	_advance_token(5);
-
-	_read_token();
-	sw a0, 0(sp) # Save the procedure name length.
-
-	# Write .type _procedure_name, @function.
-	la a0, asm_type_directive
-	_write_z();
-
-	_write_token(v0);
-	_write_z(@asm_type_function);
-
-	# Write procedure label, _procedure_name:
-	_write_token(v0);
-	_write_z(@asm_colon);
-
-	# Skip the function name and trailing parens, semicolon, "begin" and newline.
-	_advance_token(v0 + 10);
-
-	_compile_procedure_prologue();
-	_compile_procedure_body();
-
-	# Write the epilogue.
-	_write_z(@asm_epilogue);
-
-	# Skip the "end" keyword, semicolon and newline.
-	_advance_token(5);
-end;
-
-proc _compile_type();
-begin
-	# Print and skip the ".type" (5 characters) directive and a space after it.
-	_write_token(6);
-	_advance_token();
-
-	# Read and print the symbol name.
-	_read_token();
-
-	# Print and skip the symbol name, comma, space and @.
-	addi a0, a0, 3
-	_write_token();
-	_advance_token();
-
-	# Read the symbol type.
-	_read_token();
-
-	# Print the symbol type and newline.
-	addi a0, a0, 1
-	_write_token();
-	_advance_token();
-
-	# Write the object definition itself.
-	_compile_line();
-
-.compile_type_end:
-end;
-
-proc _skip_newlines();
-begin
-	# Skip newlines.
-	la t0, source_code_position
-	lw t1, (t0)
-
-.skip_newlines_loop:
-	lb t2, (t1)
-	li t3, '\n'
-	bne t2, t3, .skip_newlines_end
-	beqz t2, .skip_newlines_end
-
-	addi t1, t1, 1
-	sw t1, (t0)
-
-	goto .skip_newlines_loop;
-
-.skip_newlines_end:
-end;
-
-# Process the source code and print the generated code.
-proc _compile_module();
-begin
-.compile_module_loop:
-	_skip_newlines();
-
-	la t0, source_code_position
-	lw t0, (t0)
-	lb t0, (t0)
-	beqz t0, .compile_module_end
-	li t1, '#'
-	beq t0, t1, .compile_module_comment
-
-	# 8 is ".section" length.
-	_memcmp(source_code_position, @keyword_section, 8);
-	beqz a0, .compile_module_section
-
-	# 5 is ".type" length.
-	_memcmp(source_code_position, @keyword_type, 5);
-	beqz a0, .compile_module_type
-
-	# 5 is "proc " length. Space is needed to distinguish from "procedure".
-	_memcmp(source_code_position, @keyword_proc, 5);
-	beqz a0, .compile_module_procedure
-
-	# 6 is ".globl" length.
-	_memcmp(source_code_position, @keyword_global, 6);
-	beqz a0, .compile_module_global
-
-	# Not a known token, exit.
-	goto .compile_module_end;
-
-.compile_module_section:
-	_compile_section();
-
-	goto .compile_module_loop;
-
-.compile_module_type:
-	_compile_type();
-
-	goto .compile_module_loop;
-
-.compile_module_global:
-	_compile_line();
-
-	goto .compile_module_loop;
-
-.compile_module_comment:
-	_skip_comment();
-
-	goto .compile_module_loop;
-
-.compile_module_procedure:
-	_compile_procedure();
-
-	goto .compile_module_loop;
-
-.compile_module_end:
-end;
-
-proc _compile();
-begin
-	_compile_module();
-
-	_write_z(@asm_rodata);
-	_write_z(@asm_type_directive);
-	_write_z(@asm_strings);
-	_write_z(@asm_type_object);
-	_write_z(@asm_strings);
-	_write_c(':');
-	_write_z(@asm_ascii);
-	_write_c('"');
-
-	la t0, compiler_strings
-	sw t0, 0(sp)
-
-.compile_loop:
-	lw t0, 0(sp)
-	la t1, compiler_strings_position
-	lw t1, (t1)
-	bge t0, t1, .compile_end
-
-	lb a0, (t0)
-
-	addi t0, t0, 1
-	sw t0, 0(sp)
-
-	_write_c();
-
-	j .compile_loop
-
-.compile_end:
-	_write_c('"');
-	_write_c('\n');
-end;
-
-# Terminates the program. a0 contains the return code.
-#
-# Parameters:
-# a0 - Status code.
-proc _exit();
-begin
-	li a7, 93 # SYS_EXIT
-	ecall
-end;
-
-# Entry point.
-.globl _start
-proc _start();
-begin
-	# 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;