Is there any way to get predicted variables using python script?

Question

I have a simple program:
#include <stdio.h>

int main()
{
  int a;
  a = func(15, 3);
  return a;
}

int func(int i, int j)
{
  int b1[5], b2[10];

b2[i] = 1;
  printf("%dn", b1[j]);

return 0;
}

I am using python script to get local variables from the stripped binary, compiled using above program.
I use: function.getLocalVariables() or something like function.getStackFrame().getStackVariables() to get the local variables. Interestingly I observed that, this script doesn't give me all the variables which can be seen in the decompiler window. For e.g., in the above case, I get following in the decompiled window (for function func):

Here, the predicted buffers can be seen. But instead I get:
FUN_004004d6
array(ghidra.program.model.listing.Variable, [[undefined4 local_5c@Stack[-0x5c]:4], [undefined4 local_60@Stack[-0x60]:4]])

which are clearly not the predicted buffers. Is there any way to get those buffers?
Note: I also posted the same on ghidra github's forum.

R4444 · Accepted Answer

In case anyone wondering, I posted this question on ghidra github as well and @cetfor posted a very good way to do this. You can find that question here.
I tried to reproduce it and I was able to do this successfully.

from ghidra.app.decompiler import DecompileOptions
from ghidra.app.decompiler import DecompInterface

ifc = DecompInterface()
ifc.setOptions(DecompileOptions())
ifc.openProgram(currentProgram)

for function in functions:
    res = ifc.decompileFunction(function, 60, monitor)
    high_func = res.getHighFunction()
    lsm = high_func.getLocalSymbolMap()
    symbols = lsm.getSymbols()

for i, symbol in enumerate(symbols):
      print("Symbol {}: {} (size: {})".format(i+1, symbol.getName(), symbol.size))

Check out this endpoint for more information on highfunction. Note that I found differences in variables given by this decompiler interface and listing. Also, I couldn't find any api endpoint which gives address references by these variables (something like getReferencesTo).

Is there any way to get predicted variables using python script?

One Answer

Add your own answers!

Ask a Question