Sorry forgot to mention, my name is Tuncer. Again any help would be much appreciated. I know these maybe simple for some of you if you could lend me a hand, you will be doing a great deal of help.
Changed the subject for better understanding, Thanks again guys :) > Hi, > > I am a student at Bilkent Uni. in Turkey and using GCC as a tool for my > M.S. Thesis which is about Software Fault Tolerance. > I am stuck, in terms of implementing bit flips in the operands of a gimple > statement. > > I need to inject bit flips to all kinds of operands, constant integers, > floats, variables, pointers etc... > > It is simpler for constants, but I am having a hard time to get the value > of pointers and other variables. > > My objective is to simply change the value of a tree operand, by injecting > a new instruction that changes the value or directly change the operand to > a bit flipped value. > > For constant integers I did something like this: > > int valueBefore = TREE_INT_CST_LOW(operands[i]); > int valueAfter = (valueBefore ^ (1u << 2)); > tree number = > build_int_cst (integer_type_node, valueAfter); > > I would love it if you can help me and > may even implement a tool for GCC for error injection purposes. > > Any help would be much appreciated! > > Thank you very much! >
