如何用Common Lisp编程获取变量内存地址？SLIME/SLY实现思路

Great question! If you're looking to get that exact memory address format you see in SLIME/SLY's Inspector (like #x100cab066d1), here's what you need to know:

First, a quick heads-up: there's no standard Common Lisp function for this—memory addresses are implementation-specific details, not part of the CL standard. But all the implementations commonly used with SLIME/SLY (like SBCL) have extension functions that do exactly what you want.

For SBCL (the most common SLIME/SLY backend) #

SBCL provides the sb-kernel:get-lisp-obj-address function, which returns an integer representing the object's memory address. You can format it to match the Inspector's hex style easily:

;; Example usage
(let ((my-variable "I'm a Lisp string!"))
  (format t "Memory address: #x~X~%" (sb-kernel:get-lisp-obj-address my-variable)))

Running this will output something like Memory address: #x100cab066d1—exactly the format you see in the Inspector.

For other Common Lisp implementations #

If you're using a different CL implementation, here are the equivalent functions:

• Clozure CL (CCL): Use ccl:address-of
• CMUCL: Use ext:address-of
• CLISP: Use system:address-of

Important notes #

• These functions are non-standard extensions—they won't work across all Common Lisp implementations. Stick to them only if you're targeting a specific implementation (like SBCL for SLIME/SLY work).
• Memory addresses are rarely useful in everyday Lisp programming. You'll typically only need them for low-level debugging, performance profiling, or interacting with C code via foreign function interfaces.

内容的提问来源于stack exchange，提问作者MadPhysicist