1 /* Copyright (C) 2001 by Universitaet Karlsruhe
2 ** All rights reserved.
4 ** Authors: Goetz Lindenmaier
14 *** This file constructs the ir for the following pseudo-program:
16 *** main(int a) { // pos 0
17 *** int b = 1; // pos 1
20 *** while (0 == 2) loop {
38 ir_node *b, *x, *r, *t, *f;
40 printf("\nCreating an IR graph: WHILE_EXAMPLE...\n");
45 set_opt_constant_folding(1);
47 set_opt_dead_node_elimination (1);
49 prim_t_int = new_type_primitive(id_from_str ("int", 3), mode_i);
51 #define METHODNAME "main_tp"
55 proc_main = new_type_method(id_from_str(METHODNAME, strlen(METHODNAME)),
57 set_method_param_type(proc_main, 0, prim_t_int);
58 set_method_res_type(proc_main, 0, prim_t_int);
61 owner = new_type_class (id_from_str ("WHILE_EXAMPLE", 13));
62 ent = new_entity (owner, id_from_str ("main", strlen("main")), proc_main);
64 /* Generates start and end blocks and nodes and a first, initial block */
65 irg = new_ir_graph (ent, 4);
67 /* Generate two values */
68 set_value (0, new_Proj(get_irg_args(irg), mode_i, 0));
69 set_value (1, new_Const (mode_i, tarval_from_long (mode_i, 1)));
71 mature_block (get_irg_current_block(irg));
74 /* generate a block for the loop header and the conditional branch */
77 x = new_Cond (new_Proj(new_Cmp(new_Const (mode_i, tarval_from_long (mode_i, 0)),
78 get_value(1, mode_i)),
80 f = new_Proj (x, mode_X, 0);
81 t = new_Proj (x, mode_X, 1);
83 /* generate the block for the loop body */
89 /* The code in the loop body,
90 as we are dealing with local variables only the dataflow edges
92 set_value (2, get_value (0, mode_i));
93 set_value (0, get_value (1, mode_i));
94 set_value (1, get_value (2, mode_i));
98 /* generate the return block */
105 in[0] = new_Sub (get_value (0, mode_i), get_value (1, mode_i), mode_i);
107 x = new_Return (get_store (), 1, in);
110 /* finalize the end block generated in new_ir_graph() */
111 add_in_edge (get_irg_end_block(irg), x);
112 mature_block (get_irg_end_block(irg));
116 printf("Optimizing ...\n");
118 local_optimize_graph(irg),
119 dead_node_elimination(irg);
121 /* verify the graph */
124 /* output the vcg file */
125 printf("Done building the graph. Dumping it.\n");
126 turn_off_edge_labels();
128 dump_ir_block_graph (irg);
129 printf("Use xvcg to view this graph:\n");
130 printf("/ben/goetz/bin/xvcg GRAPHNAME\n\n");