.data
$LowerBoundErr$$:
.asciiz "Runtime error: array index less than zero\n"

.data
$ChrErr$$:
.asciiz "Runtime error: Illegal ASCII code for chr\n"

.data
$SubStrErr$$:
.asciiz "Runtime error: Access to illegal location in substring\n"

$UpperBoundErr$$:
.asciiz "Runtime error: array index greater than array size\n"

.data
$NullErr$$:
.asciiz "Runtime error: attempt to access fields of a null record\n"

.data
$SizeErr$$:
.asciiz "Runtime error: only positive size array objects can be created\n"

.data
$NewLine$$:
.asciiz "\n"

.data
$Dummy$$:
.asciiz "Dummy string\n"

.text
.globl main
main:
jal $Main$$
li $v0, 10
syscall

.text
$NullExit$$:
la $a0, $NullErr$$
li $v0, 4
syscall
li $v0, 10
syscall

.text
$LowerBoundExit$$:
la $a0, $LowerBoundErr$$
li $v0, 4
syscall
li $v0, 10
syscall

.text
$UpperBoundExit$$:
la $a0, $UpperBoundErr$$
li $v0, 4
syscall
li $v0, 10
syscall

.text
$SizeError$$:
la $a0, $SizeErr$$
li $v0, 4
syscall
li $v0, 10
syscall

.text
$Malloc$$:
sw $fp,-4($sp)
la $fp,-4($sp)
la $sp,-4($fp)
sw $ra,-4($fp)
li $v0,9
syscall
la $sp,4($fp)
lw $ra,-4($fp)
lw $fp,($fp)
jr $ra

.text
$StringLength$$:
move $t4,$zero
move $t2,$a0
NEXTSL:
lbu $t3,($t2)
beq $t3,$zero,ENDLENGTH
addi $t2,$t2,1
addi $t4,$t4,1
j NEXTSL
ENDLENGTH:
move $v0,$t4
jr $ra

# 0 - equal
# 1 - left is greater
# 2 - right is greater

.text
$StringComp$$:
sw $fp,-12($sp)
la $fp,-4($sp)
la $sp,-16($fp)
sw $ra,-12($fp)
sw $a0,-4($fp)
sw $a1,($fp)
jal $StringLength$$
sw $v0,-16($fp)
lw $a0,($fp)
jal $StringLength$$
lw $t7,-16($fp)
lw $t8,-4($fp)
lw $t9,($fp)
blt $t7,$v0,COMPLOOP
move $t7,$v0
COMPLOOP:
beq $t7,$zero,EX1
lbu $t5,($t8)
lbu $t6,($t9)
bne $t5,$t6,EX2
sub $t7,$t7,1
addi $t8,$t8,1
addi $t9,$t9,1
j COMPLOOP
EX1:
lbu $t5,($t8)
bne $t5,$zero,LGT
lbu $t6,($t9)
beq $t6,$zero,EQ
li $v0,2
j EX
EQ:
li $v0,0
j EX
EX2:
blt $t5,$t6,LLT
LGT:
li $v0,1
j EX
LLT:
li $v0,2
EX:
la $sp,4($fp)
lw $ra,-12($fp)
lw $fp,-8($fp)
jr $ra

.text
$StringEqual$$:
sw $fp,-4($sp)
la $fp,-4($sp)
la $sp,-4($fp)
sw $ra,-4($fp)
jal $StringComp$$
beq $v0,$zero,EQ1
li $v0,0
j EQEX
EQ1:
li $v0,1
EQEX:
la $sp,4($fp)
lw $ra,-4($fp)
lw $fp,($fp)
jr $ra

.text
$StringLT$$:
sw $fp,-4($sp)
la $fp,-4($sp)
la $sp,-4($fp)
sw $ra,-4($fp)
jal $StringComp$$
li $t3,2
beq $v0,$t3,LT1
li $v0,0
j LTEX
LT1:
li $v0,1
LTEX:
la $sp,4($fp)
lw $ra,-4($fp)
lw $fp,($fp)
jr $ra

.text
$StringLEQ$$:
sw $fp,-4($sp)
la $fp,-4($sp)
la $sp,-4($fp)
sw $ra,-4($fp)
jal $StringComp$$
li $t3,2
beq $v0,$t3,LEQ1
beq $v0,$zero,LEQ1
li $v0,0
j LEQEX
LEQ1:
li $v0,1
LEQEX:
la $sp,4($fp)
lw $ra,-4($fp)
lw $fp,($fp)
jr $ra

.text
$InitArray$$:
sw $fp,-12($sp)
la $fp,-4($sp)
la $sp,-12($fp)
sw $a1,($fp)
sw $a0,-4($fp)
sw $ra,-12($fp)
add $a0,$a0,1
mul $a0,$a0,4
li $v0,9
syscall
lw $t0,-4($fp)
sw $t0,($v0)
move $t1,$v0
lw $t2,($fp)
$CALoop$$:
beqz $t0, $CAEnd$$
add $t1,$t1,4
sw $t2,($t1)
sub $t0,$t0,1
j $CALoop$$
$CAEnd$$:
la $sp,4($fp)
lw $ra,-12($fp)
lw $fp,-8($fp)
jr $ra

.text
$Print$$:
sw $fp,-4($sp)
la $fp,-4($sp)
la $sp,-4($fp)
sw $ra,-4($fp)
move $a0,$a1
li $v0,4
syscall
lw $ra,-4($fp)
la $sp,4($fp)
lw $fp,($fp)
jr $ra

# doesn't seem possible to do anything more with SPIM
.text 
$Flush$$:
jr $ra

.text
$GetChar$$:
sw $fp,-4($sp)
la $fp,-4($sp)
la $sp,-8($fp)
sw $ra,-4($fp)
li $a0,2
li $v0,9
syscall
sw $v0,-8($fp)
move $a0,$v0
li $a1,2
li $v0,8
syscall
lw $v0,-8($fp)
la $sp,4($fp)
lw $ra,-4($fp)
lw $fp,($fp)
jr $ra

.text
$Ord$$:
lbu $v0,($a1)
bne $v0,$zero,NL
li $v0,-1
NL:
jr $ra

.text
$Chr$$:
blt $a1,$zero,ERR
bgt $a1,255,ERR
sw $fp,-8($sp)
la $fp,-4($sp)
la $sp,-8($fp)
sw $ra,-8($fp)
sw $a1,($fp)
li $a0,4
li $v0,9
syscall
lw $t0,($fp)
sb $t0,($v0)
sb $zero,1($v0)
la $sp,4($fp)
lw $ra,-8($fp)
lw $fp,-4($fp)
jr $ra
ERR:
la $a0,$ChrErr$$
li $v0,4
syscall
li $v0,10
syscall

.text
$Exit$$:
li $v0,10
syscall

.text
$Not$$:
beq $a1,$zero,EQZERO
li $v0,0
jr $ra
EQZERO:
li $v0,1
jr $ra

.text
$SubString$$:
sw $fp,-16($sp)
la $fp,-4($sp)
la $sp,-16($fp)
sw $ra,-16($fp)
sw $a1,-8($fp)
sw $a2,-4($fp)
sw $a3,($fp)
blt $a2,$zero,SubErr
move $a0,$a1
jal $StringLength$$
lw $t1,-4($fp)
lw $t2,($fp)
add $t0,$t1,$t2
blt $v0,$t0,SubErr
addi $a0,$t2,1
li $v0,9
syscall
move $t0,$v0
lw $t1,-8($fp)
lw $t2,-4($fp)
lw $t3,($fp)
add $t1,$t1,$t2
SSLoop:
ble $t3,$zero,FinSub
lbu $t2,($t1)
sb $t2,($t0)
addi $t0,$t0,1
addi $t1,$t1,1
sub $t3,$t3,1
j SSLoop
FinSub:
sb $zero,($t0)
lw $ra,-16($fp)
la $sp,4($fp)
lw $fp,-12($fp)
jr $ra
SubErr:
la $a0,$SubStrErr$$
li $v0,4
syscall
li $v0,10
syscall

.text
$Concat$$:
sw $fp,-12($sp)
la $fp,-4($sp)
la $sp,-20($fp)
sw $ra,-12($fp)
sw $a2,($fp)
sw $a1,-4($fp)
move $a0,$a1
jal $StringLength$$
sw $v0,-16($fp)
lw $a0,($fp)
jal $StringLength$$
sw $v0,-20($fp)
lw $t0,-16($fp)
add $a0,$t0,$v0
addi $a0,$a0,1
li $v0,9
syscall
move $t0,$v0
lw $t1,-16($fp)
lw $t2,-4($fp)
lw $t3,-20($fp)
lw $t4,($fp)
CopyOne:
ble $t1,$zero,CopyTwo
lbu $t5,($t2)
sb $t5,($t0)
addi $t2,$t2,1
addi $t0,$t0,1
sub $t1,$t1,1
j CopyOne
CopyTwo:
ble $t3,$zero,FinCat
lbu $t5,($t4)
sb $t5,($t0)
addi $t4,$t4,1
addi $t0,$t0,1
sub $t3,$t3,1
j CopyTwo
FinCat:
sb $zero,($t0)
lw $ra,-12($fp)
la $sp,4($fp)
lw $fp,-8($fp)
jr $ra


.text
$Size$$:
sw $fp,-4($sp)
la $fp,-4($sp)
la $sp,-4($fp)
sw $ra,-4($fp)
move $a0,$a1
jal $StringLength$$
lw $ra,-4($fp)
la $sp,4($fp)
lw $fp($fp)
jr $ra

.data
.align 2
L1:
.asciiz " "

.data
.align 2
L0:
.asciiz " "

.data
.align 2
L31:
.asciiz " O"

.data
.align 2
L32:
.asciiz " ."

.data
.align 2
L38:
.asciiz "
"

.data
.align 2
L41:
.asciiz "
"

.text
L21:
sw $fp,-8($sp)
la $fp,-4($sp)
la $sp,-28($fp)
L42:
sw $a0,0($fp)
sw $ra,-24($fp)
li $t0,0
sw $t0,-28($fp)
addi $t0,$fp,0
lw $t0,($t0)
addi $t0,$t0,-8
lw $t0,($t0)
sub $t0,$t0,1
sw $t0,-20($fp)
lw $t0,-20($fp)
lw $t1,-28($fp)
ble $t1,$t0,L39
L25:
addi $t0,$fp,0
lw $t0,($t0)
addi $t0,$t0,0
lw $a0,($t0)
la $a1,L41
jal $Print$$
lw $ra,-24($fp)
j L22
L39:
li $t0,0
sw $t0,-16($fp)
addi $t0,$fp,0
lw $t0,($t0)
addi $t0,$t0,-8
lw $t0,($t0)
sub $t0,$t0,1
sw $t0,-12($fp)
lw $t0,-16($fp)
lw $t1,-12($fp)
ble $t0,$t1,L36
L26:
addi $t0,$fp,0
lw $t0,($t0)
addi $t0,$t0,0
lw $a0,($t0)
la $a1,L38
jal $Print$$
lw $t0,-20($fp)
lw $t1,-28($fp)
bge $t1,$t0,L25
L40:
lw $t0,-28($fp)
addi $t0,$t0,1
sw $t0,-28($fp)
j L39
L36:
addi $t0,$fp,0
lw $t0,($t0)
lw $a0,0($t0)
addi $t0,$fp,0
lw $t0,($t0)
lw $t0,-16($t0)
lw $t1,-28($fp)
sw $t1,-8($fp)
lw $t1,($t0)
lw $t2,-8($fp)
ble $t1,$t2,L27
L28:
lw $t1,-8($fp)
bltz $t1,L29
L30:
li $t1,4
lw $t2,-8($fp)
addi $t2,$t2,1
mul $t1,$t1,$t2
add $t0,$t0,$t1
lw $t0,($t0)
lw $t1,-16($fp)
beq $t0,$t1,L33
L34:
la $a1,L32
L35:
jal $Print$$
lw $t0,-16($fp)
lw $t1,-12($fp)
bge $t0,$t1,L26
L37:
lw $t0,-16($fp)
addi $t0,$t0,1
sw $t0,-16($fp)
j L36
L27:
jal $UpperBoundExit$$
j L22
L29:
jal $LowerBoundExit$$
j L22
L33:
la $a1,L31
j L35
L22:
la $sp,4($fp)
lw $fp,-8($sp)
jr $ra

.text
L23:
sw $fp,-12($sp)
la $fp,-4($sp)
la $sp,-36($fp)
L95:
sw $a0,-4($fp)
sw $a1,0($fp)
sw $ra,-24($fp)
addi $t0,$fp,-4
lw $t0,($t0)
addi $t0,$t0,-8
lw $t0,($t0)
lw $t1,0($fp)
beq $t1,$t0,L92
L93:
li $t0,0
sw $t0,-36($fp)
addi $t0,$fp,-4
lw $t0,($t0)
addi $t0,$t0,-8
lw $t0,($t0)
sub $t0,$t0,1
sw $t0,-20($fp)
lw $t0,-20($fp)
lw $t1,-36($fp)
ble $t1,$t0,L90
L43:
L94:
li $v0,0
lw $ra,-24($fp)
j L24
L92:
addi $t0,$fp,-4
lw $a0,($t0)
jal L21
j L94
L90:
addi $t0,$fp,-4
lw $t0,($t0)
lw $t0,-12($t0)
lw $t1,-36($fp)
sw $t1,-16($fp)
lw $t1,($t0)
lw $t2,-16($fp)
ble $t1,$t2,L44
L45:
lw $t1,-16($fp)
bltz $t1,L46
L47:
li $t1,4
lw $t2,-16($fp)
addi $t2,$t2,1
mul $t1,$t1,$t2
add $t0,$t0,$t1
lw $t0,($t0)
beqz $t0,L52
L53:
L59:
L89:
lw $t0,-20($fp)
lw $t1,-36($fp)
bge $t1,$t0,L43
L91:
lw $t0,-36($fp)
addi $t0,$t0,1
sw $t0,-36($fp)
j L90
L44:
jal $UpperBoundExit$$
j L24
L46:
jal $LowerBoundExit$$
j L24
L52:
addi $t0,$fp,-4
lw $t0,($t0)
lw $t1,-20($t0)
lw $t0,0($fp)
lw $t2,-36($fp)
add $t0,$t2,$t0
lw $t2,($t1)
ble $t2,$t0,L48
L49:
bltz $t0,L50
L51:
li $t2,4
addi $t0,$t0,1
mul $t0,$t2,$t0
add $t0,$t1,$t0
lw $t0,($t0)
bnez $t0,L59
L58:
addi $t0,$fp,-4
lw $t0,($t0)
lw $t1,-24($t0)
lw $t0,-36($fp)
addi $t0,$t0,7
lw $t2,0($fp)
sub $t0,$t0,$t2
lw $t2,($t1)
ble $t2,$t0,L54
L55:
bltz $t0,L56
L57:
li $t2,4
addi $t0,$t0,1
mul $t0,$t2,$t0
add $t0,$t1,$t0
lw $t0,($t0)
bnez $t0,L89
L88:
addi $t0,$fp,-4
lw $t0,($t0)
lw $t0,-12($t0)
lw $t1,-36($fp)
sw $t1,-28($fp)
lw $t1,($t0)
lw $t2,-28($fp)
ble $t1,$t2,L60
L61:
lw $t1,-28($fp)
bltz $t1,L62
L63:
li $t1,1
li $t2,4
lw $t3,-28($fp)
addi $t3,$t3,1
mul $t2,$t2,$t3
add $t0,$t0,$t2
sw $t1,($t0)
addi $t0,$fp,-4
lw $t0,($t0)
lw $t1,-20($t0)
lw $t0,0($fp)
lw $t2,-36($fp)
add $t0,$t2,$t0
lw $t2,($t1)
ble $t2,$t0,L64
L65:
bltz $t0,L66
L67:
li $t2,1
li $t3,4
addi $t0,$t0,1
mul $t0,$t3,$t0
add $t0,$t1,$t0
sw $t2,($t0)
addi $t0,$fp,-4
lw $t0,($t0)
lw $t1,-24($t0)
lw $t0,-36($fp)
addi $t0,$t0,7
lw $t2,0($fp)
sub $t0,$t0,$t2
lw $t2,($t1)
ble $t2,$t0,L68
L69:
bltz $t0,L70
L71:
li $t2,1
li $t3,4
addi $t0,$t0,1
mul $t0,$t3,$t0
add $t0,$t1,$t0
sw $t2,($t0)
addi $t0,$fp,-4
lw $t0,($t0)
lw $t0,-16($t0)
lw $t1,0($fp)
sw $t1,-12($fp)
lw $t1,($t0)
lw $t2,-12($fp)
ble $t1,$t2,L72
L73:
lw $t1,-12($fp)
bltz $t1,L74
L75:
li $t1,4
lw $t2,-12($fp)
addi $t2,$t2,1
mul $t1,$t1,$t2
add $t0,$t0,$t1
lw $t1,-36($fp)
sw $t1,($t0)
addi $t0,$fp,-4
lw $a0,($t0)
lw $t0,0($fp)
addi $a1,$t0,1
jal L23
addi $t0,$fp,-4
lw $t0,($t0)
lw $t0,-12($t0)
lw $t1,-36($fp)
sw $t1,-32($fp)
lw $t1,($t0)
lw $t2,-32($fp)
ble $t1,$t2,L76
L77:
lw $t1,-32($fp)
bltz $t1,L78
L79:
li $t1,0
li $t2,4
lw $t3,-32($fp)
addi $t3,$t3,1
mul $t2,$t2,$t3
add $t0,$t0,$t2
sw $t1,($t0)
addi $t0,$fp,-4
lw $t0,($t0)
lw $t1,-20($t0)
lw $t0,0($fp)
lw $t2,-36($fp)
add $t0,$t2,$t0
lw $t2,($t1)
ble $t2,$t0,L80
L81:
bltz $t0,L82
L83:
li $t2,0
li $t3,4
addi $t0,$t0,1
mul $t0,$t3,$t0
add $t0,$t1,$t0
sw $t2,($t0)
addi $t0,$fp,-4
lw $t0,($t0)
lw $t1,-24($t0)
lw $t0,-36($fp)
addi $t0,$t0,7
lw $t2,0($fp)
sub $t0,$t0,$t2
lw $t2,($t1)
ble $t2,$t0,L84
L85:
bltz $t0,L86
L87:
li $t2,0
li $t3,4
addi $t0,$t0,1
mul $t0,$t3,$t0
add $t0,$t1,$t0
sw $t2,($t0)
j L89
L48:
jal $UpperBoundExit$$
j L24
L50:
jal $LowerBoundExit$$
j L24
L54:
jal $UpperBoundExit$$
j L24
L56:
jal $LowerBoundExit$$
j L24
L60:
jal $UpperBoundExit$$
j L24
L62:
jal $LowerBoundExit$$
j L24
L64:
jal $UpperBoundExit$$
j L24
L66:
jal $LowerBoundExit$$
j L24
L68:
jal $UpperBoundExit$$
j L24
L70:
jal $LowerBoundExit$$
j L24
L72:
jal $UpperBoundExit$$
j L24
L74:
jal $LowerBoundExit$$
j L24
L76:
jal $UpperBoundExit$$
j L24
L78:
jal $LowerBoundExit$$
j L24
L80:
jal $UpperBoundExit$$
j L24
L82:
jal $LowerBoundExit$$
j L24
L84:
jal $UpperBoundExit$$
j L24
L86:
jal $LowerBoundExit$$
j L24
L24:
la $sp,4($fp)
lw $fp,-12($sp)
jr $ra

.text
$Main$$:
sw $fp,-8($sp)
la $fp,-4($sp)
la $sp,-44($fp)
L96:
sw $a0,0($fp)
sw $ra,-44($fp)
li $t0,8
sw $t0,-8($fp)
addi $t0,$fp,-12
sw $t0,-40($fp)
lw $a0,-8($fp)
li $a1,0
bltz $a0,L13
L14:
jal $InitArray$$
lw $t0,-40($fp)
sw $v0,($t0)
addi $t0,$fp,-16
sw $t0,-36($fp)
lw $a0,-8($fp)
li $a1,0
bltz $a0,L15
L16:
jal $InitArray$$
lw $t0,-36($fp)
sw $v0,($t0)
addi $t0,$fp,-20
sw $t0,-32($fp)
addi $t0,$fp,-8
lw $t0,($t0)
addi $t1,$fp,-8
lw $t1,($t1)
add $t0,$t0,$t1
sub $a0,$t0,1
li $a1,0
bltz $a0,L17
L18:
jal $InitArray$$
lw $t0,-32($fp)
sw $v0,($t0)
addi $t0,$fp,-24
sw $t0,-28($fp)
addi $t0,$fp,-8
lw $t0,($t0)
addi $t1,$fp,-8
lw $t1,($t1)
add $t0,$t0,$t1
sub $a0,$t0,1
li $a1,0
bltz $a0,L19
L20:
jal $InitArray$$
lw $t0,-28($fp)
sw $v0,($t0)
li $a1,0
move $a0,$fp
jal L23
lw $ra,-44($fp)
j L12
L13:
jal $SizeError$$
j L12
L15:
jal $SizeError$$
j L12
L17:
jal $SizeError$$
j L12
L19:
jal $SizeError$$
j L12
L12:
la $sp,4($fp)
lw $fp,-8($sp)
jr $ra