3

My HexRays decompiler output often looks like:

  v0 = LoadLibraryW(L"wininet.dll");
  v1 = v0;
  if ( !v0 )
    goto LABEL_1;
  v2 = GetProcAddress(v0, "InternetOpenW");
  v3 = GetProcAddress(v1, "InternetConnectW");
  v4 = v2;
  v5 = v4;

To me, there's just a couple variables here. v0, v2, and v3. The rest are entirely duplicate. Is it possible to clean up my decompiler output to eliminate these extraneous variables?

5

Locate cursor at v1 and press = . If I remember it correctly since IDA 6.6 it will allow you to define that some variable is actually same as other.

2

Starting from v6.6, IDA supports decompiler API. The documentation is poor, almost non-existing. Yet, in theory, it should be possible to write a plugin to perform static analysis on the abstract syntax tree (AST) produced by the decompiler, thereby eliminating useless unit assignments.

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