On 4 July 2011 16:13, Jonathan Wakely <jwakely.gcc@xxxxxxxxx> wrote: > On 4 July 2011 15:28, konica sarker wrote: >> "A tree is a pointer type, but the object to which it points may be of >> a variety of types" >> >> suppose i have a tree t; >> can you help me, how to identify the object type of the tree? > > From http://gcc.gnu.org/onlinedocs/gccint/Tree-overview.html > > "You can tell what kind of node a particular tree is by using the > TREE_CODE macro." > >> what does the function TREE_TYPE() do? > > From http://gcc.gnu.org/onlinedocs/gccint/Macros-and-Functions.html > > "Many trees store the type of an expression or declaration in this field." > > And from gcc/tree.h: > > /* In all nodes that are expressions, this is the data type of the expression. > In POINTER_TYPE nodes, this is the type that the pointer points to. > In ARRAY_TYPE nodes, this is the type of the elements. > In VECTOR_TYPE nodes, this is the type of the elements. */ > #define TREE_TYPE(NODE) __extension__ \ > (*({__typeof (NODE) const __t = CONTAINS_STRUCT_CHECK (NODE, TS_TYPED); \ > &__t->typed.type; })) > The way i tend to think of tree's is just DAG's, http://gcc.gnu.org/wiki/GenericAPI I started documenting more there, but i will continue to add to that as its no where near complete.
