In MIPS, I know that I can declare an array as:
在MIPS中，我知道可以将数组声明为:
list: .space 20
However, what if I wanted to create an array of different size based on user input? Is this possible?
但是，如果我想根据用户输入创建一个不同大小的数组，该怎么办?这是可能的吗?
For example, the program would ask the user to input an integer N and create an array of length N.
例如，程序将要求用户输入一个整数N并创建一个长度为N的数组。
2 个解决方案
#1
2
That's a good question. In assembly language, variables declared as you've done are statically allocated, that is they're allocated at assembly time. If you want to allocate a variable based on user input at run time you have at least two choices: Allocate space on the stack (and watch for stack overflow) or allocate from a memory pool, usually called the heap. In either case, the allocation is done at rum time rather than at assembly time.
这是一个很好的问题。在汇编语言中，像您所做的那样声明的变量是静态分配的，即它们是在汇编时分配的。如果您希望在运行时基于用户输入分配变量，您至少有两个选择:在堆栈上分配空间(并注意堆栈溢出)或从内存池中分配(通常称为堆)。在任何一种情况下，分配都是在朗姆时间完成的，而不是在组装时间。
#2
2
You can use system call 9 to allocate memory on the heap
您可以使用system call 9在堆上分配内存
li $a0, numbytes
li $v0, 9
syscall
The address is returned in $v0
地址以$v0返回
#1
2
That's a good question. In assembly language, variables declared as you've done are statically allocated, that is they're allocated at assembly time. If you want to allocate a variable based on user input at run time you have at least two choices: Allocate space on the stack (and watch for stack overflow) or allocate from a memory pool, usually called the heap. In either case, the allocation is done at rum time rather than at assembly time.
这是一个很好的问题。在汇编语言中，像您所做的那样声明的变量是静态分配的，即它们是在汇编时分配的。如果您希望在运行时基于用户输入分配变量，您至少有两个选择:在堆栈上分配空间(并注意堆栈溢出)或从内存池中分配(通常称为堆)。在任何一种情况下，分配都是在朗姆时间完成的，而不是在组装时间。
#2
2
You can use system call 9 to allocate memory on the heap
您可以使用system call 9在堆上分配内存
li $a0, numbytes
li $v0, 9
syscall
The address is returned in $v0
地址以$v0返回