1 /* Copyright (C) 2001 by Universitaet Karlsruhe
2 ** All rights reserved.
4 ** Authors: Goetz Lindenmaier
17 *** This file constructs the ir for the following pseudo-program:
19 *** main(int a) { // pos 0
20 *** int b = 1; // pos 1
23 *** while (0 == 2) loop {
41 ir_node *b, *x, *r, *t, *f;
43 printf("\nCreating an IR graph: WHILE_EXAMPLE...\n");
48 set_opt_constant_folding(1);
50 set_opt_dead_node_elimination (1);
52 prim_t_int = new_type_primitive(id_from_str ("int", 3), mode_i);
54 #define METHODNAME "main_tp"
58 proc_main = new_type_method(id_from_str(METHODNAME, strlen(METHODNAME)),
60 set_method_param_type(proc_main, 0, prim_t_int);
61 set_method_res_type(proc_main, 0, prim_t_int);
64 owner = new_type_class (id_from_str ("WHILE_EXAMPLE", 13));
65 ent = new_entity (owner, id_from_str ("main", strlen("main")), proc_main);
67 /* Generates start and end blocks and nodes and a first, initial block */
68 irg = new_ir_graph (ent, 4);
70 /* Generate two values */
71 set_value (0, new_Proj(get_irg_args(irg), mode_i, 0));
72 set_value (1, new_Const (mode_i, tarval_from_long (mode_i, 1)));
74 mature_block (get_irg_current_block(irg));
77 /* generate a block for the loop header and the conditional branch */
80 x = new_Cond (new_Proj(new_Cmp(new_Const (mode_i, tarval_from_long (mode_i, 0)),
81 get_value(1, mode_i)),
83 f = new_Proj (x, mode_X, 0);
84 t = new_Proj (x, mode_X, 1);
86 /* generate the block for the loop body */
92 /* The code in the loop body,
93 as we are dealing with local variables only the dataflow edges
95 set_value (2, get_value (0, mode_i));
96 set_value (0, get_value (1, mode_i));
97 set_value (1, get_value (2, mode_i));
101 /* generate the return block */
108 in[0] = new_Sub (get_value (0, mode_i), get_value (1, mode_i), mode_i);
110 x = new_Return (get_store (), 1, in);
113 /* finalize the end block generated in new_ir_graph() */
114 add_in_edge (get_irg_end_block(irg), x);
115 mature_block (get_irg_end_block(irg));
119 printf("Optimizing ...\n");
121 local_optimize_graph(irg),
122 dead_node_elimination(irg);
124 /* verify the graph */
127 /* output the vcg file */
128 printf("Done building the graph. Dumping it.\n");
129 turn_off_edge_labels();
131 dump_ir_block_graph (irg);
132 printf("Use xvcg to view this graph:\n");
133 printf("/ben/goetz/bin/xvcg GRAPHNAME\n\n");