有一个箭头指向当前指令，你可以像在源代码buffer中一样设置和清除断点。
An overlay arrow points to the current instruction, and you can set and remove breakpoints as with the source buffer.
为了简化他们选择在PC暴露当前指令的地址取指令，而不是当前正在执行的指令的设计。
To simplify the design they chose to have the PC expose the address of the current instruction fetch, rather than the currently executing instruction.
为了简化他们选择在PC暴露当前指令的地址取指令，而不是当前正在执行的指令的设计。
To simplify the design they chose to have the PC expose the address of the current instruction fetch, rather than the currently executing instruction.
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