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如何在 GDB 中打印类型属性？

发布于 2024-07-18 02:19:59 字数 43 浏览 5 评论 0原文

有没有办法从 GDB 内部打印类型属性？
例如整数的大小。

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木落 2024-07-25 02:19:59

是：

(gdb) p thing'attribute

某些属性可以被识别，而另一些属性则不能。（在下面列出的内容中，Found 是一个布尔变量。）

gdb) p integer'size
Attempt to use a type name as an expression
(gdb) p found'size
$2 = 8
(gdb) p integer'first
$3 = -2147483648
(gdb) p integer'last
$4 = 2147483647

以下是使用 gdb 进行调试的 Ada 部分：（

Only a subset of the attributes are supported:
 
     * 'First, 'Last, and 'Length on array objects (not on types and subtypes).
     * 'Min and 'Max.
     * 'Pos and 'Val.
     * 'Tag.
     * 'Range on array objects (not subtypes), but only as the right operand of the membership (in) operator.
     * 'Access, 'Unchecked_Access, and 'Unrestricted_Access (a GNAT extension).
     * 'Address.

嗯，该列表可能已过时，因为我可以执行 Integer'Last，尽管第一个项目符号表示它对类型无效。）

Yes:

(gdb) p thing'attribute

Some attributes are recognized, and others aren't. (In what's listed below, Found is a Boolean variable.)

gdb) p integer'size
Attempt to use a type name as an expression
(gdb) p found'size
$2 = 8
(gdb) p integer'first
$3 = -2147483648
(gdb) p integer'last
$4 = 2147483647

Here's the list from the Ada section of Debugging with gdb:

Only a subset of the attributes are supported:
 
     * 'First, 'Last, and 'Length on array objects (not on types and subtypes).
     * 'Min and 'Max.
     * 'Pos and 'Val.
     * 'Tag.
     * 'Range on array objects (not subtypes), but only as the right operand of the membership (in) operator.
     * 'Access, 'Unchecked_Access, and 'Unrestricted_Access (a GNAT extension).
     * 'Address.

(Hmm, that list may be dated, since I could do Integer'Last, despite the first bullet saying that it's not valid on types.)

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