Move stages into subdirectories

1 files changed, 0 insertions, 971 deletions

diff --git a/boot/stage3.elna b/boot/stage3.elna
deleted file mode 100644
index aec9832..0000000
--- a/boot/stage3.elna
+++ /dev/null
@@ -1,971 +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 3 compiler.
-#
-# - Procedures with multiple arguments.
-# - Character literals with and without escaping.
-
-.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 "ret"
-
-.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, -32\n\tsw ra, 28(sp)\n\tsw s0, 24(sp)\n\taddi s0, sp, 32\n"
-
-.type asm_epilogue, @object
-asm_epilogue: .string "\tlw ra, 28(sp)\n\tlw s0, 24(sp)\n\taddi sp, sp, 32\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_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_sw, @object
-asm_sw: .string "\tsw "
-
-.type asm_mv, @object
-asm_mv: .string "mv "
-
-.type asm_t0, @object
-asm_t0: .string "t0"
-
-.type asm_a0, @object
-asm_a0: .string "a0"
-
-.type asm_comma, @object
-asm_comma: .string ", "
-
-.type asm_sp, @object
-asm_sp: .string "(sp)"
-
-.section .bss
-
-# When modifiying also change the read size in the entry point procedure.
-.type source_code, @object
-source_code: .zero 81920
-
-.section .data
-
-.type source_code_position, @object
-source_code_position: .word source_code
-
-.section .text
-
-# 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();
-
-	lw a0, 0(sp)
-end;
-
-# Writes a number to the standard output.
-#
-# Parameters:
-# a0 - Whole number.
-proc _write_i();
-begin
-	addi a1, sp, 0
-	_print_i();
-
-	mv a1, a0
-	addi a0, sp, 0
-	_write_s();
-
-end;
-
-# Writes a character from a0 into the standard output.
-proc _write_c();
-begin
-	sb a0, 0(sp)
-	addi a0, sp, 0
-	li a1, 1
-	_write_s();
-end;
-
-# Write null terminated string.
-#
-# Parameters:
-# a0 - String.
-proc _write_z();
-begin
-	sw a0, 0(sp)
-
-.write_z_loop:
-	# Check for 0 character.
-	lb a0, (a0)
-	beqz a0, .write_z_end
-
-	# Print a character.
-	lw a0, 0(sp)
-	lb a0, (a0)
-	_write_c();
-
-	# Advance the input string by one byte.
-	lw a0, 0(sp)
-	addi a0, a0, 1
-	sw a0, 0(sp)
-
-	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
-	li t0, 'A' - 1
-	sltu t1, t0, a0 # t1 = a0 >= 'A'
-
-	sltiu t2, a0, 'Z' + 1 # t2 = a0 <= 'Z'
-	and a0, t1, t2 # t1 = a0 >= 'A' & a0 <= 'Z'
-end;
-
-# Detects if a0 is an lowercase character. Sets a0 to 1 if so, otherwise to 0.
-proc _is_lower();
-begin
-	li t0, 'a' - 1
-	sltu t2, t0, a0 # t2 = a0 >= 'a'
-
-	sltiu t3, a0, 'z' + 1 # t3 = a0 <= 'z'
-	and a0, t2, t3 # t2 = a0 >= 'a' & a0 <= 'z'
-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(v00);
-
-	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
-	li t0, '0' - 1
-	sltu t1, t0, a0 # t1 = a0 >= '0'
-
-	sltiu t2, a0, '9' + 1 # t2 = a0 <= '9'
-
-	and a0, t1, t2
-end;
-
-proc _is_alnum();
-begin
-	sw a0, 4(sp)
-
-	_is_alpha();
-	sw a0, 0(sp)
-
-	_is_digit(v04);
-
-	lw a1, 0(sp)
-	or a0, a0, a1
-end;
-
-# Reads the next token.
-#
-# Returns token length in a0.
-proc _read_token();
-begin
-	la t0, source_code_position # Token pointer.
-	lw t0, (t0)
-	sw t0, 0(sp) # Current token position.
-	sw zero, 4(sp) # Token length.
-
-.read_token_loop:
-	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.
-	lw t0, 4(sp)
-	addi t0, t0, 1
-	sw t0, 4(sp)
-
-	lw t0, 0(sp)
-	addi t0, t0, 1
-	sw t0, 0(sp)
-
-	goto .read_token_loop;
-
-.read_token_end:
-	lw a0, 4(sp)
-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
-	sw a0, 0(sp)
-
-	la a0, source_code_position
-	lw a0, (a0)
-	lw a1, 0(sp)
-	_write_s();
-
-	lw a0, 0(sp)
-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
-	la a0, asm_li
-	_write_z();
-
-	la a0, asm_a0
-	_write_z();
-
-	la a0, asm_comma
-	_write_z();
-
-	_read_token();
-	_write_token();
-	_advance_token();
-
-	_write_c('\n');
-end;
-
-proc _compile_character_literal();
-begin
-	la a0, asm_li
-	_write_z();
-
-	la a0, asm_a0
-	_write_z();
-
-	la a0, asm_comma
-	_write_z();
-
-  li a0, '\''
-	_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
-	
-  li a0, '\\'
-	_write_c();
-	_advance_token(1);
-
-.compile_character_literal_end:
-	la t0, source_code_position
-	lw t0, (t0)
-	lb a0, (t0)
-	_write_c();
-
-	li a0, '\''
-	_write_c();
-
-	_write_c('\n');
-
-	_advance_token(2);
-
-end;
-
-proc _compile_variable_expression();
-begin
-	la a0, asm_lw
-	_write_z();
-
-	la a0, asm_a0
-	_write_z();
-
-	la a0, asm_comma
-	_write_z();
-
-	_advance_token(1);
-	_read_token();
-	_write_token();
-	_advance_token();
-
-	la a0, asm_sp
-	_write_z();
-
-	_write_c('\n');
-
-end;
-
-proc _compile_expression();
-begin
-	la t0, source_code_position
-	lw t0, (t0)
-	lb a0, (t0)
-
-	li t1, '\''
-	beq a0, t1, .compile_expression_character_literal
-
-	li t1, 'v'
-	beq a0, t1, .compile_expression_variable
-
-	_is_digit();
-	bnez a0, .compile_expression_integer_literal
-
-	goto .compile_expression_end;
-
-.compile_expression_character_literal:
-	_compile_character_literal();
-	goto .compile_expression_end;
-
-.compile_expression_integer_literal:
-	_compile_integer_literal();
-	goto .compile_expression_end;
-
-.compile_expression_variable:
-	_compile_variable_expression();
-	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)
-	la t0, source_code_position
-	lw t0, (t0)
-	sw t0, 4(sp)
-
-	sw zero, 8(sp)
-
-	# Skip the identifier and left paren.
-	addi a0, a0, 1
-	_advance_token();
-
-	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.
-	la a0, asm_sw
-	_write_z();
-
-	la a0, asm_a0
-	_write_z();
-
-	la a0, asm_comma
-	_write_z();
-
-	# Calculate the stack offset: 20 - (4 * argument_counter)
-	lw t0, 8(sp)
-	li t1, 4
-	mul t0, t0, t1
-	li t1, 20
-	sub a0, t1, t0
-	_write_i();
-
-	la a0, asm_sp
-	_write_z();
-
-	_write_c('\n');
-
-	# Add one to the argument counter.
-	lw t0, 8(sp)
-	addi t0, t0, 1
-	sw t0, 8(sp)
-
-	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.
-	lw t0, 8(sp)
-	addi t0, t0, -1
-	sw t0, 8(sp)
-
-	la a0, asm_lw
-	_write_z();
-
-	_write_c('a');
-	lw a0, 8(sp)
-	_write_i();
-
-	la a0, asm_comma
-	_write_z();
-
-	# Calculate the stack offset: 20 - (4 * argument_counter)
-	lw t0, 8(sp)
-	li t1, 4
-	mul t0, t0, t1
-	li t1, 20
-	sub a0, t1, t0
-	_write_i();
-
-	la a0, asm_sp
-	_write_z();
-
-	_write_c('\n');
-
-	goto .compile_call_finalize;
-
-.compile_call_end:
-	la a0, asm_call
-	_write_z();
-
-	lw a0, 4(sp)
-	lw a1, 0(sp)
-	_write_s();
-
-	# Skip the right paren.
-	_advance_token(1);
-end;
-
-proc _compile_goto();
-begin
-	_advance_token(5);
-
-	_read_token();
-	sw a0, 0(sp)
-
-	la a0, asm_j
-	_write_z();
-
-	_write_token(v00);
-	_advance_token();
-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
-
-	_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_semicolon:
-	_advance_token(2);
-
-	_write_c('\n');
-
-.compile_statement_end:
-end;
-
-proc _compile_procedure_body();
-begin
-.compile_procedure_body_loop:
-	la a0, source_code_position
-	lw a0, (a0)
-	la a1, keyword_end
-	li a2, 3 # "end" length.
-	_memcmp();
-
-	beqz a0, .compile_procedure_body_epilogue
-
-	_compile_statement();
-	goto .compile_procedure_body_loop;
-
-.compile_procedure_body_epilogue:
-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(v00);
-
-	la a0, asm_type_function
-	_write_z();
-
-	# Write procedure label, _procedure_name:
-	_write_token(v00);
-
-	la a0, asm_colon
-	_write_z();
-
-	# Skip the function name and trailing parens, semicolon, "begin" and newline.
-	lw a0, 0(sp)
-	addi a0, a0, 10
-	_advance_token();
-
-	la a0, asm_prologue
-	_write_z();
-
-	_compile_procedure_body();
-
-	# Write the epilogue.
-	la a0, asm_epilogue
-	_write_z();
-
-	# 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();
-	la t0, source_code_position
-	lw t0, (t0)
-	sw t0, 12(sp)
-
-	# 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();
-begin
-.compile_loop:
-	_skip_newlines();
-
-	la t0, source_code_position
-	lw t0, (t0)
-	lb t0, (t0)
-	beqz t0, .compile_end
-	li t1, '#'
-	beq t0, t1, .compile_comment
-
-	la a0, source_code_position
-	lw a0, (a0)
-	la a1, keyword_section
-	li a2, 8 # ".section" length.
-	_memcmp();
-
-	beqz a0, .compile_section
-
-	la a0, source_code_position
-	lw a0, (a0)
-	la a1, keyword_type
-	li a2, 5 # ".type" length.
-	_memcmp();
-
-	beqz a0, .compile_type
-
-	la a0, source_code_position
-	lw a0, (a0)
-	la a1, keyword_proc
-	li a2, 5 # "proc " length. Space is needed to distinguish from "procedure".
-	_memcmp();
-
-	beqz a0, .compile_procedure
-
-	la a0, source_code_position
-	lw a0, (a0)
-	la a1, keyword_global
-	li a2, 6 # ".globl" length.
-	_memcmp();
-
-	beqz a0, .compile_global
-	# Not a known token, exit.
-	goto .compile_end;
-
-.compile_section:
-	_compile_section();
-
-	goto .compile_loop;
-
-.compile_type:
-	_compile_type();
-
-	goto .compile_loop;
-
-.compile_global:
-	_compile_line();
-
-	goto .compile_loop;
-
-.compile_comment:
-	_skip_comment();
-
-	goto .compile_loop;
-
-.compile_procedure:
-	_compile_procedure();
-
-	goto .compile_loop;
-
-.compile_end:
-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.
-	la a0, source_code
-	li a1, 81920 # Buffer size.
-	_read_file();
-	_compile();
-
-	_exit(0);
-
-end;