[PATCH] D21242: [esan|cfrag] Handle complex GEP instr in the cfrag tool

[Qin Zhao via llvm-commits]

zhaoqin created this revision.
zhaoqin added a reviewer: aizatsky.
zhaoqin added subscribers: llvm-commits, bruening, eugenis, kcc, zhaoqin, vitalybuka.

Handles complext GEP instructions by iterating all (except the first and
the last) idx within the GEP instruction and instrumenting nested struct
field address calculation.

An example of complex gep instruction:
 getelementptr %struct.ST, %struct.ST* %s, i64 1,  i32 2, i32 1, i64 5, i64 13

Adds test struct_field_gep.ll for complex GEP instructions test.

http://reviews.llvm.org/D21242

Files:
  lib/Transforms/Instrumentation/EfficiencySanitizer.cpp
  test/Instrumentation/EfficiencySanitizer/struct_field_gep.ll

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