| 术语 | block activation |
| 释义 | block activation 块赋活 In VAX／VMS and VAXC, the run-time action of activating a block or function, in which local auto and register variables are allocated storage and, if they are declared with initializers, given initial values. The block activation precedes the execution of any executable statements in the function or block. Functions are activated when they are called. Internal blocks(compound statements) are activated when the program control flows into them. Internal blocks are not activated if they are entered by a GOTO statement, unless the GOTO target is the label of the block itself rather than the label of some statement within the block. If a block is entered by a GOTO statement, references to auto and register variables still are valid references, but the variables may not be properly initialized. 在(DEC公司的)操作系统VAX／VMS及VAXC中,启动一个块或功能的运行时动作,其中局部自 变量和寄存器变量分配有存储区,如果这些量是用初始程序加以说明,则给出初始值。块赋活 先于功能或块中可执行语句的执行。功能在被调用时启动。内部块(复合语句)在程序控制流 进入它们时被启动。如果程序控制流是通过一条GOTO语句进入块的,则内部块不能被启动,除 非GOTO的目标是块本身的标号,而不是块内一些语句的标号。如果通过一条GOTO语句进入块, 则引用自变量和寄存器变量仍然是有效引用,但是这些变量可能会发生初始化错误。 |
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