hi, I am working on gcc ssa name. For each function, we can traverse all defined ssa name by macro FOR_EACH_SSA_NAME. If a ssa name is default definition for a symbol (check SSA_NAME_IS_DEFAULT_DEF) , I can get the symbol by SSA_NAME_VAR. But for a virtual DEFAULT DEF, I cannot get it, SSA_NAME_VAR return a identifier named .MEM. I cannot find which variable related to the default definition. Why and how I should find the related variable?
By the way , I give my current work, I wish find a MEM_REF refer to global/heap memory or local stack. I try my best to get a correct memory type. Since MEM_REF have a base address, which is often a ssa name. Athough it is not virtual ssa name. But I find just check ssa name data flow is not enough to get the info. For example, a malloc function allocate some heap memory and record the address in a global ptr. On gimple ssa IR, the malloc function return a address assigned to a ssa name , then ssa name assign the value to the global ptr. When i check ssa name defined by the global ptr, I donot know if the ptr point to global memory or local memory. Please see the gimple code: _2 = malloc() ptr = _2 _3 = ptr MEM_REF[BASE _3] I wish get _3 is a address pointing to global memory. But just from _3=ptr, cannot judge it. I wish memory SSA can help solve the problem. Or gcc gives the info at other pass? wish get some advice. Thanks a lot.
