宏以分配内存中的空间 [英] macro to allocate space in memory

问题描述

我需要让一个程序集程序员来计算 帕斯卡三角形 . 这样存储在内存中的每行Pascal三角形都与另一行分开 我想制造一个，但是我不知道如何使用宏在组装中做到这一点.

i need to make an assembly programmer to calculate pascal triangle . so that every line of pascal triangle stored in memory place separate from other line i want to make one but i have no idea how to do it in assembly using macro .

宏获取一个数字并在内存中分配该数字的dword

macro take an number and allocate that number of dword in memory

我做了尝试，但是我不知道这是否是正确的方法

i did a try but i don't know if it is the correct way to do it

%macro Malloc 2
%2 : resd %1
%endmacro

我想知道2件事:

第一我希望第二个参数(％2 )自动具有字符串名称，例如

first i want the second arg ( %2 ) to have a string name automatically for example

第一行名称:"line1"，下一行为"line2"，"line3" ...，依此类推，所以我不需要放下自己?

first line name :"line1" and next line to be "line2" "line3" ... and so on so i don't need to put my self ?

第二件事是在这种情况下使用宏是一个好主意吗?

second thing is this is a good idea to use macro in this case ?

推荐答案

对于NASM :您想要的是

For NASM: What you want here is the %+ operator to concatenate things (after expanding single-line %assign macros), inside a %rep block.

section .bss

%assign i 1
%rep    64
    line %+ i:  resd  i
%assign i i+1
%endrep

它的组装方式与

section .bss
line1:    resd 1     # reserve space for 1 DWORD
line2:    resd 2     # reserve space for 2 DWORDs
line3:    resd 3     # reserve space for 3 DWORDs
...

---

测试:

---

Testing:

$ nasm -felf64  pascal-triangle-macro.asm
$ nm -n pascal-triangle-macro.o        # sort by numeric address, not lexicographic

0000000000000000 b line1
0000000000000004 b line2
000000000000000c b line3
0000000000000018 b line4
0000000000000028 b line5
000000000000003c b line6
0000000000000054 b line7
0000000000000070 b line8
0000000000000090 b line9
00000000000000b4 b line10
00000000000000dc b line11
0000000000000108 b line12
...

如预期的那样，标签地址呈几何级数. (因为它是一个目标文件，而不是链接的可执行文件，所以从0开始).

As expected, the label addresses are in a geometric progression. (Starting from 0 because this is an object file, not a linked executable).

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