Hi,
I am trying to understand contents of basicblock.h
file.
In that basic block is defined as a structure.
My question is why its definition is followd by
GTY(..........) at 214. What kind of syntax is that?
I am unable to understand lines 220 and 221.
Are they defining pointers to functions?
Thanks in advance.
214 struct basic_block_def GTY((chain_next
("%h.next_bb"), chain_prev ("%h.prev_bb")))
215 {
216 /* Pointers to the first and last trees of
the block. */
217 tree stmt_list;
218
219 /* The edges into and out of the block. */
220 VEC(edge,gc) *preds;
221 VEC(edge,gc) *succs;
222
223 /* Auxiliary info specific to a pass. */
224 PTR GTY ((skip (""))) aux;
225
226 /* Innermost loop containing the block. */
227 struct loop * GTY ((skip (""))) loop_father;
228
229 /* The dominance and postdominance
information node. */
230 struct et_node * GTY ((skip (""))) dom[2];
231
232 /* Previous and next blocks in the chain.
*/
233 struct basic_block_def *prev_bb;
234 struct basic_block_def *next_bb;
235
236 union basic_block_il_dependent {
237 struct rtl_bb_info * GTY ((tag ("1")))
rtl;
238 } GTY ((desc ("((%1.flags & BB_RTL) !=
0)"))) il;
239
240 /* Chain of PHI nodes for this block. */
241 tree phi_nodes;
242
243 /* A list of predictions. */
244 struct edge_prediction *predictions;
245
246 /* Expected number of executions: calculated
in profile.c. */
247 gcov_type count;
248
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