java - 我应该如何解释 JVM 指令集文档中的 "Operand Stack"？

Question

我在看章节6. The Java Virtual Machine Instruction Set
当我阅读下面摘录中的“操作数堆栈”时，我不确定如何解释该部分。尤其是箭头，是栈内还是栈外的意思吗？

mnemonic
Operation
    Short description of the instruction

Format

    mnemonic
    operand1
    operand2
    ...
Forms
    mnemonic = opcode

Operand Stack
    ..., value1, value2 →

    ..., value3

Description
    A longer description detailing constraints on operand stack contents or constant pool entries, the operation performed, the type of the results, etc.

Answer 1

我想这在“注释”部分中有解释:

In the description of the Java Virtual Machine instructions, the effect of an instruction's execution on the operand stack (§2.6.2) of the current frame (§2.6) is represented textually, with the stack growing from left to right and each value represented separately. Thus,

..., value1, value2 →

..., result

shows an operation that begins by having value2 on top of the operand stack with value1 just beneath it.