C++来打气/ 8汇编语言的帮助（链接的数据结构）

Question

对于我我CSCI类的我有这个C++程序翻译成装配在PEP/8：

#include <iostream> 
using namespace std; 

struct node { 
int data; 
node* next; 
}; 

int main() { 
node *first, *p; 
int value, sum; 
first = 0; 
cin>>value; 
while (value != -9999) { 
p =first; 
first = new node; 
first->data = value; 
first->next = p; 
cin>>value; 
} 

for (p=first;p != 0; p = p->next) { 
cout<<p->data<<' '; 
} 

sum = 0; 
p = first; 
while (p != 0) { 
sum += p->data; 
p = p->next; 
} 

cout <<"Sum: "<<sum<<endl; 
return 0; 
} 

以下是我对大会翻译至今：

BR  main 
data: .EQUATE 0 
next: .EQUATE 2 
; 
;*********main() 
first: .EQUATE 6   ;local variables 
p:  .EQUATE 4      
value: .EQUATE 2 
sum:  .EQUATE 0 

main: SUBSP 8, i   
     LDA 0, i   ;first = 0 
     STA first, s 
     DECI value, s  ;cin>>value 
while: LDA value, s  ;while (value != -9999) 
     CPA -9999, i 
     BREQ endWh 
     LDA first, s 
     STA p, s   ;p=first 
     LDA 4, i   ;first = new node 
     CALL new 
     STX first, s 
     LDA value, s  ;first->data =value 
     LDX data, i 
     STA first, sxf 
     LDA p, s   ;first->next = p 
     LDX next, i 
     STA first, sxf 
     DECI value, s  ;cin>>value 
     BR while 
endWh: LDA first, s   ;for (p=first 
     STA p, s 
for:  LDA p, s   ;p != 0 
     CPA 0, i 
     BREQ endFor 
     LDX data, i   ;cout<<p->data 
     DECO p, sxf 
     CHARO ' ', i 
     LDX next, i   ;p=p->next 
     LDA p, sxf 
     STA p, s 
     BR for 
endFor: LDA 0, i 
     STA sum, s   ;sum = 0 
     LDA first, s  ;p = first 
     STA p, s 
while1: LDA p, s   ;(while p != 0) 
     CPA 0, i 
     BREQ endWh2 
     LDX data, i   ;sum += p->data 
     LDA p, sxf 
     ADDA data, sxf     
     STA sum, s   
     LDX next, i   ;p = p->next; 
     LDA p, sxf 
     STA p, s 
     BR while1 
endWh2: LDA sum, s 
     STRO msg1, d  ;"Sum = " 
     DECO sum, s   ;<<sum 
     CHARO '\n', i  ;<<endl 
     ADDSP 8, i 
     STOP 

msg1: .ASCII "Sum: \x00"       

; 
;*******operator new 
new:  LDX hpPtr, d 
     ADDA hpPtr, d 
     STA hpPtr, d 
     RET0 
hpPtr: .ADDRSS heap 
heap: .BLOCK 1 
     .END 

我遇到麻烦

sum += p->data 

线组装工作，

 LDX data, i   
    LDA p, sxf 
    ADDA data, sxf     
    STA sum, s 

我觉得我在与寻址模式什么麻烦......

Answer 1

我无法找到很多关于PEP/8好消息，所以这是一个有点拍摄在黑暗中，但因为这没有任何其他答案到目前为止，我会试试看：

在我看来，你没有计算

sum = p->data + sum

但

sum = p>data + some_weird_things_that's_improperly_addressed

对我来说，似乎应该是

LDX data, i   
LDA p, sxf //load p->data into regA 
ADDA sum, s //add sum to regA, regA now is p->data + sum    
STA sum, s //store regA back to sum