Caché Language Elements For Error Processing

最新推荐文章于 2024-01-29 11:58:50 发布

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最新推荐文章于 2024-01-29 11:58:50 发布

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分类专栏： Cache数据库整理

本文链接：https://blog.youkuaiyun.com/qq_42557052/article/details/89642758

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本文深入探讨了编程语言中的特殊变量及其在错误处理中的作用，包括$ECode用于触发和检查错误，$ETrap执行错误后的代码，$ZTrap跳转到错误处理地址，$STack记录错误时的调用堆栈层级，以及$EStack和$ZError缓存的错误信息。文章还介绍了$Quit变量在用户定义函数中的应用，以及ZTrap和ZQuit命令在模拟和处理错误中的功能。

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Language element Explanation

$ECode

$ECode Is empty ("") or set with a standard error code. $ECode
can be set to initiate an error and to check the errorprocessing logic.

$ETrap

$ETrap Contains the (arbitrary) code to be executed after an error.

$ZTrap

$ZTrap Contains a branch address to which a jump is made after an
error and where the processing continues.

$STack

$STack Contains the number of the stack level.

$EStack

$EStack As $STack, but the New command can be used.

$Quit

$Quit Is TRUE (1) when it is invoked in the context of a userdefined function, otherwise 0 in normal subroutines.
Special variables

$ZError

$ZError Caché error code after an error, e.g.,
Label+2^Prog1
Functions $STack Records the routine environment after an error in the
various stack levels.
Commands ZQuit Deletes all or a specified number of stack levels.
ZTrap Can be set in a routine to simulate an error.