blob: 841404482bcfbd278a13378be1a357a6d6930f7b (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
|
# All program code is placed after the
# .text assembler directive
.text
# Declare main as a global function
.globl main
j main
# code for identity
identity:
# Entering a new scope.
# Symbols in symbol table:
# println
# x
# return
# Update the stack pointer.
addi $sp $sp -0
# Get x's offset from $sp from the symbol table and initialize x's address with it. We'll add $sp later.
li $t1 -4
# Add the stack pointer address to the offset.
add $t1 $t1 $sp
# Load the value of x.
lw $t0 0($t1)
sw $t0 -8($sp)
jr $ra
# Exiting scope.
addi $sp $sp 0
jr $ra
# code for add
add:
# Entering a new scope.
# Symbols in symbol table:
# println
# x
# y
# return
# Update the stack pointer.
addi $sp $sp -0
# Get x's offset from $sp from the symbol table and initialize x's address with it. We'll add $sp later.
li $t1 -4
# Add the stack pointer address to the offset.
add $t1 $t1 $sp
# Load the value of x.
lw $t0 0($t1)
# Get y's offset from $sp from the symbol table and initialize y's address with it. We'll add $sp later.
li $t2 -8
# Add the stack pointer address to the offset.
add $t2 $t2 $sp
# Load the value of y.
lw $t1 0($t2)
add $t0 $t0 $t1
sw $t0 -12($sp)
jr $ra
# Exiting scope.
addi $sp $sp 0
jr $ra
# code for main
main:
# Entering a new scope.
# Symbols in symbol table:
# println
# return
# Update the stack pointer.
addi $sp $sp -0
# println
la $a0 datalabel0
li $v0 4
syscall
la $a0 newline
li $v0 4
syscall
# println
# Calling function identity
# Save $ra to a register
move $t0 $ra
# Save $t0-9 registers
sw $t0 -4($sp)
# Evaluate parameters and save to stack
li $t1 7
sw $t1 -8($sp)
# Update the stack pointer
add $sp $sp -4
# Call the function
jal identity
# Restore the stack pointer
add $sp $sp 4
# Restore $t0-9 registers
lw $t0 -4($sp)
# Restore $ra
move $ra $t0
# Get return value off stack
lw $t0 -12($sp)
move $a0 $t0
li $v0 1
syscall
la $a0 newline
li $v0 4
syscall
# println
# Calling function add
# Save $ra to a register
move $t0 $ra
# Save $t0-9 registers
sw $t0 -4($sp)
# Evaluate parameters and save to stack
li $t1 3
sw $t1 -8($sp)
li $t1 4
sw $t1 -12($sp)
# Update the stack pointer
add $sp $sp -4
# Call the function
jal add
# Restore the stack pointer
add $sp $sp 4
# Restore $t0-9 registers
lw $t0 -4($sp)
# Restore $ra
move $ra $t0
# Get return value off stack
lw $t0 -16($sp)
move $a0 $t0
li $v0 1
syscall
la $a0 newline
li $v0 4
syscall
# Exiting scope.
addi $sp $sp 0
li $v0 10
syscall
# All memory structures are placed after the
# .data assembler directive
.data
newline: .asciiz "\n"
datalabel0: .asciiz "This program prints 7 7"
|
