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Update ch02-03.assignment.md #6

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Update ch02-03.assignment.md
pitaohc Mar 19, 2024
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Update ch02-03.assignment.md
pitaohc Mar 25, 2024
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4 changes: 2 additions & 2 deletions src/ch02-03.assignment.md
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Expand Up @@ -16,7 +16,7 @@ Name = exp

- `local = const`，把常量加载到栈上指定位置，对应字节码`LoadNil`、`LoadBool`、`LoadInt`和`LoadConst`等。
- `local = local`，复制栈上值，对应字节码`Move`。
- `local = global`，把栈上值赋值给全局变量，对应字节码`GetGlobal`。
- `local = global`，把全局变量复制到栈上指定位置，对应字节码`GetGlobal`。

- `global = const`，把*常量*赋值给全局变量，需要首先把常量加到常量表中，然后通过字节码`SetGlobalConst`完成赋值。
- `global = local`，把*局部变量*赋值给全局变量，对应字节码`SetGlobal`。
Expand Down Expand Up @@ -152,4 +152,4 @@ print(g)

其次，等号`=`后面的表达式现在分为3类，对于3个字节码。后续如果要引入其他类型的表达式，比如upvalue、表索引（比如`t.k`）、或者运算结果（比如`a+b`），那是要给每个类型都增加一个字节码吗？答案是，不能。但这会涉及到一些现在还没遇到的问题，所以也不好解释。如果不能的话，那需要怎么办？这也涉及到上面提到的`ExpDesc`。

我们在后续会实现Lua完整的赋值语句，届时现在的赋值代码就会被完全舍弃。
我们在后续会实现Lua完整的赋值语句，届时现在的赋值代码就会被完全舍弃。