Can you guys please help me for variables and pointers ? Any ideas or pointers will be fine!
Thank you very much in advance. > Thank you very much Richard, > > Very good starter for me but I am actually having the hardest time with > variables, pointers etc... > > I know this may be a lot to ask but, > If you could help me with this I will very much appreciate it. > > Thanks again very much! > I will be sure to include your name in my paper :) > >> On Tue, Sep 3, 2013 at 7:59 PM, <ttur...@cs.bilkent.edu.tr> wrote: >>> 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 :) >> Something like >> oldop = gimple_assign_rhs1 (stmt); >> gsi = gsi_for_stmt (stmt); >> newop = force_gimple_operand_gsi (&gsi, fold_build2 (BIT_IOR_EXPR, >> TREE_TYPE (oldop), oldop, build_int_cst (TREE_TYPE (oldop), 1<<3)), > true, NULL_TREE, true, GSI_CONTINUE_LINKING); >> gimple_assign_set_rhs1 (stmt, newop); >> update_stmt (stmt); >>>> 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! > > > >
