Cil.cilVisitorA visitor interface for traversing CIL trees. Create instantiations of this type by specializing the class nopCilVisitor. Each of the specialized visiting functions can also call the queueInstr to specify that some instructions should be inserted before the current instruction or statement. Use syntax like self#queueInstr to call a method associated with the current object.
method vvdec : varinfo -> varinfo visitActionInvoked for each variable declaration. The subtrees to be traversed are those corresponding to the type and attributes of the variable. Note that variable declarations are all the GVar, GVarDecl, GFun, all the varinfo in formals of function types, and the formals and locals for function definitions. This means that the list of formals in a function definition will be traversed twice, once as part of the function type and second as part of the formals in a function definition.
method vvrbl : varinfo -> varinfo visitActionInvoked on each variable use. Here only the SkipChildren and ChangeTo actions make sense since there are no subtrees. Note that the type and attributes of the variable are not traversed for a variable use
method vexpr : exp -> exp visitActionInvoked on each expression occurrence. The subtrees are the subexpressions, the types (for a Cast or SizeOf expression) or the variable use.
method vlval : lval -> lval visitActionInvoked on each lvalue occurrence
method voffs : offset -> offset visitActionInvoked on each offset occurrence that is *not* as part of an initializer list specification, i.e. in an lval or recursively inside an offset.
method vinitoffs : offset -> offset visitActionInvoked on each offset appearing in the list of a CompoundInit initializer.
method vinst : instr -> instr list visitActionInvoked on each instruction occurrence. The ChangeTo action can replace this instruction with a list of instructions
method vstmt : stmt -> stmt visitActionControl-flow statement. The default DoChildren action does not create a new statement when the components change. Instead it updates the contents of the original statement. This is done to preserve the sharing with Goto and Case statements that point to the original statement. If you use the ChangeTo action then you should take care of preserving that sharing yourself.
method vblock : block -> block visitActionBlock.
method vfunc : fundec -> fundec visitActionFunction definition. Replaced in place.
method vglob : global -> global list visitActionGlobal (vars, types, etc.)
method vinit : varinfo -> offset -> init -> init visitActionInitializers for static, const and global variables, pass the variable where this occurs, and the offset
method vtype : typ -> typ visitActionUse of some type. Note that for structure/union and enumeration types the definition of the composite type is not visited. Use vglob to visit it.
method vattr : attribute -> attribute list visitActionAttribute. Each attribute can be replaced by a list
method vattrparam : attrparam -> attrparam visitActionAttribute parameters.
method queueInstr : instr list -> unitAdd here instructions while visiting to queue them to precede the current statement or instruction being processed. Use this method only when you are visiting an expression that is inside a function body, or a statement, because otherwise there will no place for the visitor to place your instructions.
method unqueueInstr : unit -> instr listGets the queue of instructions and resets the queue. This is done automatically for you when you visit statements.