Is there a list of Ghidra's variable prefixes?

Question

In Ghidra, the decompiler prepends various prefixes to variable names. For instance, iVar1 is an integer. However, there are a lot of prefixes that aren't immediately obvious, find some below, but I'm looking for a complete dictionary if anyone knows where it is:

• local_31
• auStack8320
• uStack4
• DAT_<addr>

Answer 1

This is annoyingly hard to find the answer to. This is a good starting point, but I don't think I found everything yet.

1. Variable names
   1. From Function.java:
      1. param_
      2. local_
      3. local_res
      4. temp_
   2. From database.cc <-- this function has most (maybe all?) of the variable naming logic. There are multiple pieces of this function that I don't yet understand; I'm pretty confident there are additional variable naming conventions hiding in there.
      1. unaff_retaddr
      2. unaff_
      3. in_
      4. param_
         1. While also referenced in Function.java, I believe this is where the name is actually generated.
      5. extraout_
      6. Var
         1. Seems to usually be prefixed by something else (like i in your example)
   3. I think this function in varmap.cc is the one that creates stack variables, but I haven't yet confirmed.
2. Label names (from SymbolUtilities.java):
   1. SUB_
   2. LAB_
   3. DAT_
   4. UNK_
   5. EXT_
   6. FUN_
   7. OFF_

Also useful, the FindPotentialDecompilerProblems.java script has some explanations for what some of these mean. Namely, some of the variants of extraout, in_, and unaff_.