Replace variable name taking care of shadow variables

Asked Feb 28 '15 at 07:22

Active Feb 28 '15 at 08:20

Viewed 74 times

I'm parsing a GLSL source code and I need to replace global variable name with a new name. The problem is how to take care of shadow variable? For example, in the following source code, I would like to replace lines a = 1 and a = 3 but not a = 2 because of the local declaration.

int a; // To be replaced

void some_function(void)
{
    a = 1; // To be replaced
    {
         int a;
         a = 2; // To be kept
    }
    a = 3; // To be replaced
}

I'm using pyparsing but I did not find a solution (apart using nestedExpr and re-parsing each block).

edited Feb 28 '15 at 08:20

asked Feb 28 '15 at 07:22

Nicolas Rougier

"C-like source code?" so is this C or not? I just did this kind of stuff for javascript source 2 days ago (name mangling); you need to preferably make this into a proper abstract syntax tree and then visit the nodes noting all variables that are declared there, then calculating which of them are global etc. – Antti Haapala -- Слава Україні Feb 28 '15 at 08:01
This is GLSL code (corrected) but I don't want to go into a full parser. The goal is only to mangle names such as to be able to mix shader snippets together. – Nicolas Rougier Feb 28 '15 at 08:21
1

in that case it is safe to mangle *all* variables :D – Antti Haapala -- Слава Україні Feb 28 '15 at 09:45
You're right ! I need to test the idea but I do not see obvious problems. Thanks. – Nicolas Rougier Feb 28 '15 at 10:07

Replace variable name taking care of shadow variables

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