856 lines
14 KiB
Plaintext
856 lines
14 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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# Stage2 compiler.
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#
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# It supports declaring and calling procedures without arguments.
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# A procedure name should start with an underscore.
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.section .rodata
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.type keyword_equ, @object
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keyword_equ: .ascii ".equ"
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.equ KEYWORD_EQU_SIZE, 4
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.type keyword_section, @object
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keyword_section: .ascii ".section"
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.equ KEYWORD_SECTION_SIZE, 8
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.type keyword_type, @object
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keyword_type: .ascii ".type"
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.equ KEYWORD_TYPE_SIZE, 5
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.type keyword_ret, @object
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keyword_ret: .ascii "ret"
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.equ KEYWORD_RET_SIZE, 3
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.type keyword_global, @object
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keyword_global: .ascii ".globl"
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.equ KEYWORD_GLOBAL_SIZE, 6
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.type keyword_proc, @object
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keyword_proc: .ascii "proc "
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.equ KEYWORD_PROC_SIZE, 5
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.type keyword_end, @object
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keyword_end: .ascii "end"
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.equ KEYWORD_END_SIZE, 3
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.type keyword_begin, @object
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keyword_begin: .ascii "begin"
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.equ KEYWORD_BEGIN_SIZE, 5
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.type keyword_var, @object
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keyword_var: .ascii "var"
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.equ KEYWORD_VAR_SIZE, 3
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.type asm_prologue, @object
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asm_prologue: .string "\taddi sp, sp, -32\n\tsw ra, 28(sp)\n\tsw s0, 24(sp)\n\taddi s0, sp, 32\n"
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.type asm_epilogue, @object
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asm_epilogue: .string "\tlw ra, 28(sp)\n\tlw s0, 24(sp)\n\taddi sp, sp, 32\n\tret\n"
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.type asm_type_directive, @object
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asm_type_directive: .string ".type "
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.type asm_type_function, @object
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asm_type_function: .string ", @function\n"
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.type asm_colon, @object
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asm_colon: .string ":\n"
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.type asm_call, @object
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asm_call: .string "\tcall "
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.type asm_j, @object
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asm_j: .string "\tj "
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.type asm_li, @object
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asm_li: .string "\tli "
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.type asm_lw, @object
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asm_lw: .string "\tlw "
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.type asm_t0, @object
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asm_t0: .string "t0"
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.type asm_a0, @object
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asm_a0: .string "a0"
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.type asm_comma, @object
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asm_comma: .string ", "
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.type asm_sp, @object
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asm_sp: .string "(sp)"
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.section .bss
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.equ SOURCE_BUFFER_SIZE, 81920
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.type source_code, @object
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source_code: .zero SOURCE_BUFFER_SIZE
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.section .data
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.type source_code_position, @object
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source_code_position: .word source_code
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.section .text
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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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#
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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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mv a2, a1
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mv a1, a0
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# STDIN.
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li a0, 0
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li a7, 63 # SYS_READ.
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ecall
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end;
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# Writes to the standard output.
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#
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# Parameters:
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# a0 - Buffer.
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# a1 - Buffer length.
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proc _write();
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begin
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mv a2, a1
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mv a1, a0
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# STDOUT.
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li a0, 1
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li a7, 64 # SYS_WRITE.
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ecall
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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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sb a0, 20(sp)
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addi a0, sp, 20
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li a1, 1
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_write();
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end;
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# Write null terminated string.
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#
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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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sw a0, 20(sp)
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.write_z_loop:
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# Check for 0 character.
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lb a0, (a0)
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beqz a0, .write_z_end
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# Print a character.
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lw a0, 20(sp)
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lb a0, (a0)
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_write_c();
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# Advance the input string by one byte.
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lw a0, 20(sp)
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addi a0, a0, 1
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sw a0, 20(sp)
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j .write_z_loop
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.write_z_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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li t0, 'A' - 1
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sltu t1, t0, a0 # t1 = a0 >= 'A'
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sltiu t2, a0, 'Z' + 1 # t2 = a0 <= 'Z'
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and a0, t1, t2 # t1 = a0 >= 'A' & a0 <= 'Z'
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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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li t0, 'a' - 1
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sltu t2, t0, a0 # t2 = a0 >= 'a'
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sltiu t3, a0, 'z' + 1 # t3 = a0 <= 'z'
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and a0, t2, t3 # t2 = a0 >= 'a' & a0 <= 'z'
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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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#
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# Paramters:
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# a0 - Tested character.
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#
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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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sw a0, 20(sp)
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_is_upper();
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sw a0, 16(sp)
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lw a0, 20(sp)
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_is_lower();
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lw t0, 20(sp)
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xori t1, t0, '_'
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seqz t1, t1
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lw t0, 16(sp)
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or a0, a0, t0
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or a0, a0, t1
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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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#
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# Parameters:
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# a0 - Exemined value.
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#
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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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li t0, '0' - 1
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sltu t1, t0, a0 # t1 = a0 >= '0'
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sltiu t2, a0, '9' + 1 # t2 = a0 <= '9'
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and a0, t1, t2
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end;
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# Reads the next token.
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#
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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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la t0, source_code_position # Token pointer.
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lw t0, (t0)
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sw t0, 20(sp) # Current token position.
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sw zero, 16(sp) # Token length.
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.read_token_loop:
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lb t0, (t0) # Current character.
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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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li t1, '.'
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beq t0, t1, .read_token_next
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lw a0, 20(sp)
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lb a0, (a0)
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_is_alpha();
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bnez a0, .read_token_next
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lw a0, 20(sp)
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lb a0, (a0)
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_is_digit();
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bnez a0, .read_token_next
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j .read_token_end
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.read_token_next:
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# Advance the source code position and token length.
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lw t0, 16(sp)
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addi t0, t0, 1
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sw t0, 16(sp)
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lw t0, 20(sp)
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addi t0, t0, 1
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sw t0, 20(sp)
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j .read_token_loop
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.read_token_end:
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lw a0, 16(sp)
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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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#
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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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mv t0, a0
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li a0, 0
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.Lmemcmp_loop:
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beqz a2, .Lmemcmp_end
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lbu t1, (t0)
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lbu t2, (a1)
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sub a0, t1, t2
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bnez a0, .Lmemcmp_end
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addi t0, t0, 1
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addi a1, a1, 1
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addi a2, a2, -1
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j .Lmemcmp_loop
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.Lmemcmp_end:
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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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# Skip the .equ directive.
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la t0, source_code_position
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lw t1, (t0)
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add t1, t1, a0
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sw t1, (t0)
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end;
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# Prints the current token.
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#
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# Parameters:
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# a0 - Token length.
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#
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# Returns a0 unchanged.
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proc _write_token();
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begin
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sw a0, 20(sp)
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la a0, source_code_position
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lw a0, (a0)
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lw a1, 20(sp)
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_write();
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lw a0, 20(sp)
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end;
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proc _compile_section();
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begin
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# Print and skip the .section directive and a space after it.
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li a0, KEYWORD_SECTION_SIZE + 1
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_write_token();
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_advance_token();
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# Read the section name.
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_read_token();
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addi a0, a0, 1
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_write_token();
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_advance_token();
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end;
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# Prints and skips a line.
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proc _skip_comment();
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begin
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la t0, source_code_position
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lw t1, (t0)
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.skip_comment_loop:
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# Check for newline character.
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lb t2, (t1)
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li t3, '\n'
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beq t2, t3, .skip_comment_end
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# Advance the input string by one byte.
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addi t1, t1, 1
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sw t1, (t0)
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j .skip_comment_loop
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.skip_comment_end:
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# Skip the newline.
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addi t1, t1, 1
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sw t1, (t0)
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end;
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# Prints and skips a line.
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proc _compile_line();
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begin
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.compile_line_loop:
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la a0, source_code_position
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lw a1, (a0)
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lb t0, (a1)
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li t1, '\n'
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beq t0, t1, .compile_line_end
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# Print a character.
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lw a0, (a1)
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_write_c();
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# Advance the input string by one byte.
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li a0, 1
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_advance_token();
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j .compile_line_loop
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.compile_line_end:
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li a0, '\n'
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_write_c();
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li a0, 1
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_advance_token();
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end;
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proc _compile_integer_literal();
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begin
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la a0, asm_li
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_write_z();
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la a0, asm_a0
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_write_z();
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la a0, asm_comma
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_write_z();
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_read_token();
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_write_token();
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_advance_token();
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li a0, '\n'
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_write_c();
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end;
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proc _compile_character_literal();
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begin
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la a0, asm_li
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_write_z();
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la a0, asm_a0
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_write_z();
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la a0, asm_comma
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_write_z();
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.compile_character_literal_loop:
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la a0, source_code_position
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lw a0, (a0)
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li a1, 1
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_write();
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li a0, 1
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_advance_token();
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la t0, source_code_position
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lw t0, (t0)
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lb a0, (t0)
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li t1, '\''
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beq a0, t1, .compile_character_literal_end
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j .compile_character_literal_loop
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.compile_character_literal_end:
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li a0, '\''
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_write_c();
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li a0, '\n'
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_write_c();
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li a0, 1
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_advance_token();
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end;
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proc _compile_variable_expression();
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begin
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la a0, asm_lw
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_write_z();
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la a0, asm_a0
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_write_z();
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la a0, asm_comma
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_write_z();
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la a0, source_code_position
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lw a0, (a0)
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addi a0, a0, 1
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li a1, 2
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_write();
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la a0, asm_sp
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_write_z();
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li a0, '\n'
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_write_c();
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li a0, 3
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_advance_token();
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end;
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proc _compile_expression();
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begin
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la t0, source_code_position
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lw t0, (t0)
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lb a0, (t0)
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li t1, '\''
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beq a0, t1, .compile_expression_character_literal
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li t1, 'v'
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beq a0, t1, .compile_expression_variable
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_is_digit();
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bnez a0, .compile_expression_integer_literal
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j .compile_expression_end
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.compile_expression_character_literal:
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_compile_character_literal();
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j .compile_expression_end
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.compile_expression_integer_literal:
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_compile_integer_literal();
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j .compile_expression_end
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.compile_expression_variable:
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_compile_variable_expression();
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j .compile_expression_end;
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.compile_expression_end:
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end;
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proc _compile_call();
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begin
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_read_token();
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sw a0, 20(sp)
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la t0, source_code_position
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lw t0, (t0)
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sw t0, 16(sp)
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# Skip the identifier and left paren.
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addi a0, a0, 1
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_advance_token();
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la t0, source_code_position
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lw t0, (t0)
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lb t0, (t0)
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li t1, ')'
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beq t0, t1, .compile_call_finalize
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_compile_expression();
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.compile_call_finalize:
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la a0, asm_call
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_write_z();
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lw a0, 16(sp)
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lw a1, 20(sp)
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_write();
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# Skip the right paren.
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li a0, 1
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_advance_token();
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end;
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proc _compile_goto();
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begin
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li a0, 5
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_advance_token();
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_read_token();
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sw a0, 20(sp)
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la a0, asm_j
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_write_z();
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lw a0, 20(sp)
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_write_token();
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_advance_token();
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end;
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proc _compile_statement();
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begin
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# This is a call if the statement starts with an underscore.
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la t0, source_code_position
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lw t0, (t0)
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# First character after alignment tab.
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addi t0, t0, 1
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lb t0, (t0)
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li t1, '_'
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beq t0, t1, .compile_statement_call
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li t1, 'g'
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beq t0, t1, .compile_statement_goto
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_compile_line();
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j .compile_statement_end
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.compile_statement_call:
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li a0, 1
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_advance_token();
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_compile_call();
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j .compile_statement_semicolon
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.compile_statement_goto:
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li a0, 1
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_advance_token();
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_compile_goto();
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j .compile_statement_semicolon
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.compile_statement_semicolon:
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li a0, 2
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_advance_token();
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li a0, '\n'
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_write_c();
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.compile_statement_end:
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end;
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|
|
|
proc _compile_procedure_body();
|
|
begin
|
|
.compile_procedure_body_loop:
|
|
la a0, source_code_position
|
|
lw a0, (a0)
|
|
la a1, keyword_end
|
|
li a2, KEYWORD_END_SIZE
|
|
_memcmp();
|
|
|
|
beqz a0, .compile_procedure_body_epilogue
|
|
|
|
_compile_statement();
|
|
j .compile_procedure_body_loop
|
|
|
|
.compile_procedure_body_epilogue:
|
|
end;
|
|
|
|
proc _compile_procedure();
|
|
begin
|
|
# Skip "proc ".
|
|
li a0, KEYWORD_PROC_SIZE
|
|
_advance_token();
|
|
|
|
_read_token();
|
|
sw a0, 20(sp) # Save the procedure name length.
|
|
|
|
# Write .type _procedure_name, @function.
|
|
la a0, asm_type_directive
|
|
_write_z();
|
|
|
|
lw a0, 20(sp)
|
|
_write_token();
|
|
|
|
la a0, asm_type_function
|
|
_write_z();
|
|
|
|
# Write procedure label, _procedure_name:
|
|
lw a0, 20(sp)
|
|
_write_token();
|
|
|
|
la a0, asm_colon
|
|
_write_z();
|
|
|
|
# Skip the function name and trailing parens, semicolon, "begin" and newline.
|
|
lw a0, 20(sp)
|
|
addi a0, a0, KEYWORD_BEGIN_SIZE + 1 + 4
|
|
_advance_token();
|
|
|
|
la a0, asm_prologue
|
|
_write_z();
|
|
|
|
_compile_procedure_body();
|
|
|
|
# Write the epilogue.
|
|
la a0, asm_epilogue
|
|
_write_z();
|
|
|
|
li a0, KEYWORD_END_SIZE + 2
|
|
_advance_token();
|
|
end;
|
|
|
|
proc _compile_type();
|
|
begin
|
|
# Print and skip the .type directive and a space after it.
|
|
li a0, KEYWORD_TYPE_SIZE + 1
|
|
_write_token();
|
|
_advance_token();
|
|
|
|
# Read and print the symbol name.
|
|
_read_token();
|
|
sw a0, 20(sp)
|
|
|
|
# Print and skip the symbol name, comma, space and @.
|
|
lw a0, 20(sp)
|
|
addi a0, a0, 3
|
|
_write_token();
|
|
_advance_token();
|
|
|
|
# Read the symbol type.
|
|
_read_token();
|
|
sw a0, 16(sp)
|
|
la t0, source_code_position
|
|
lw t0, (t0)
|
|
sw t0, 12(sp)
|
|
|
|
# Print the symbol type and newline.
|
|
lw a0, 16(sp)
|
|
addi a0, a0, 1
|
|
_write_token();
|
|
_advance_token();
|
|
|
|
# Write the object definition itself.
|
|
_compile_line();
|
|
|
|
.compile_type_end:
|
|
end;
|
|
|
|
proc _compile_equ();
|
|
begin
|
|
# Print and skip the .equ directive and a space after it.
|
|
li a0, KEYWORD_EQU_SIZE + 1
|
|
_write_token();
|
|
_advance_token();
|
|
|
|
# Read and print the constant name.
|
|
_read_token();
|
|
sw a0, 20(sp)
|
|
|
|
# Print and skip the constant name, comma and space.
|
|
lw a0, 20(sp)
|
|
addi a0, a0, 2
|
|
_write_token();
|
|
_advance_token();
|
|
|
|
# Read the constant value.
|
|
_read_token();
|
|
sw a0, 16(sp)
|
|
|
|
# Print and skip the constant value and newline.
|
|
lw a0, 16(sp)
|
|
addi a0, a0, 1
|
|
_write_token();
|
|
_advance_token();
|
|
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)
|
|
|
|
j .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_equ
|
|
li a2, KEYWORD_EQU_SIZE
|
|
_memcmp();
|
|
|
|
beqz a0, .compile_equ
|
|
|
|
la a0, source_code_position
|
|
lw a0, (a0)
|
|
la a1, keyword_section
|
|
li a2, KEYWORD_SECTION_SIZE
|
|
_memcmp();
|
|
|
|
beqz a0, .compile_section
|
|
|
|
la a0, source_code_position
|
|
lw a0, (a0)
|
|
la a1, keyword_type
|
|
li a2, KEYWORD_TYPE_SIZE
|
|
_memcmp();
|
|
|
|
beqz a0, .compile_type
|
|
|
|
la a0, source_code_position
|
|
lw a0, (a0)
|
|
la a1, keyword_proc
|
|
li a2, KEYWORD_PROC_SIZE
|
|
_memcmp();
|
|
|
|
beqz a0, .compile_procedure
|
|
|
|
la a0, source_code_position
|
|
lw a0, (a0)
|
|
la a1, keyword_global
|
|
li a2, KEYWORD_GLOBAL_SIZE
|
|
_memcmp();
|
|
|
|
beqz a0, .compile_global
|
|
# Not a known token, exit.
|
|
j .compile_end
|
|
|
|
.compile_equ:
|
|
_compile_equ();
|
|
|
|
j .compile_loop
|
|
|
|
.compile_section:
|
|
_compile_section();
|
|
|
|
j .compile_loop
|
|
|
|
.compile_type:
|
|
_compile_type();
|
|
|
|
j .compile_loop
|
|
|
|
.compile_global:
|
|
_compile_line();
|
|
|
|
j .compile_loop
|
|
|
|
.compile_comment:
|
|
_skip_comment();
|
|
|
|
j .compile_loop
|
|
|
|
.compile_procedure:
|
|
_compile_procedure();
|
|
|
|
j .compile_loop
|
|
|
|
.compile_end:
|
|
end;
|
|
|
|
# Entry point.
|
|
.globl _start
|
|
proc _start();
|
|
begin
|
|
# Read the source from the standard input.
|
|
la a0, source_code
|
|
li a1, SOURCE_BUFFER_SIZE # Buffer size.
|
|
_read_file();
|
|
_compile();
|
|
|
|
# Call exit.
|
|
li a0, 0 # Use 0 return code.
|
|
li a7, 93 # SYS_EXIT.
|
|
ecall
|
|
end;
|