3 * File name: testprograms/while_example.c
4 * Purpose: Construct a loop.
5 * Author: Goetz Lindenmaier
9 * Copyright: (c) 1999-2003 Universität Karlsruhe
10 * Licence: This file protected by GPL - GNU GENERAL PUBLIC LICENSE.
15 #include <libfirm/firm.h>
18 * This file constructs the ir for the following pseudo-program:
20 * main(int a) { // pos 0
24 * while (0 == 2) loop {
37 const char *suffix = "";
43 ir_node *b, *x, *r, *t, *f;
45 printf("\nCreating an IR graph: WHILE_EXAMPLE...\n");
50 set_opt_constant_folding(1);
53 prim_t_int = new_type_primitive(new_id_from_chars("int", 3), mode_Is);
55 #define METHODNAME "main_tp"
59 proc_main = new_type_method(new_id_from_chars(METHODNAME, strlen(METHODNAME)),
61 set_method_param_type(proc_main, 0, prim_t_int);
62 set_method_res_type(proc_main, 0, prim_t_int);
65 owner = new_type_class(new_id_from_chars("WHILE_EXAMPLE", 13));
66 ent = new_entity(owner, new_id_from_chars("main", strlen("main")), proc_main);
67 get_entity_ld_name(ent); /* force name mangling */
69 /* Generates start and end blocks and nodes and a first, initial block */
70 irg = new_ir_graph(ent, 4);
72 /* Generate two values */
73 set_value(0, new_Proj(get_irg_args(irg), mode_Is, 0));
74 set_value(1, new_Const(mode_Is, new_tarval_from_long(1, mode_Is)));
76 mature_immBlock(get_irg_current_block(irg));
79 /* generate a block for the loop header and the conditional branch */
81 add_immBlock_pred(r, x);
82 x = new_Cond(new_Proj(new_Cmp(new_Const(mode_Is, new_tarval_from_long(0, mode_Is)),
83 get_value(1, mode_Is)),
85 f = new_Proj(x, mode_X, pn_Cond_false);
86 t = new_Proj(x, mode_X, pn_Cond_true);
88 /* generate the block for the loop body */
90 add_immBlock_pred(b, t);
92 add_immBlock_pred(r, x);
94 /* The code in the loop body,
95 as we are dealing with local variables only the dataflow edges
97 set_value(2, get_value(0, mode_Is));
98 set_value(0, get_value(1, mode_Is));
99 set_value(1, get_value(2, mode_Is));
103 /* generate the return block */
105 add_immBlock_pred(r, f);
110 in[0] = new_Sub(get_value(0, mode_Is), get_value(1, mode_Is), mode_Is);
112 x = new_Return(get_store(), 1, in);
115 /* finalize the end block generated in new_ir_graph() */
116 add_immBlock_pred(get_irg_end_block(irg), x);
117 mature_immBlock(get_irg_end_block(irg));
119 irg_finalize_cons(irg);
121 printf("Optimizing ...\n");
123 local_optimize_graph(irg),
124 dead_node_elimination(irg);
126 /* verify the graph */
129 /* output the vcg file */
130 printf("Done building the graph. Dumping it.\n");
131 turn_off_edge_labels();
132 dump_all_types(suffix);
133 dump_ir_block_graph(irg, suffix);
134 printf("Use ycomp to view this graph:\n");
135 printf("ycomp WHILE_EXAMPLE\n\n");