--- /dev/null
+/*
+ * Project: libFIRM
+ * File name: testprograms/while_example.c
+ * Purpose: Construct a loop.
+ * Author: Goetz Lindenmaier
+ * Modified by:
+ * Created:
+ * CVS-ID: $Id$
+ * Copyright: (c) 1999-2003 Universität Karlsruhe
+ * Licence: This file protected by GPL - GNU GENERAL PUBLIC LICENSE.
+ */
+
+
+# include <stdio.h>
+# include <string.h>
+
+# include "irvrfy.h"
+# include "irdump.h"
+# include "firm.h"
+
+/**
+ * This file constructs the ir for the following pseudo-program:
+ *
+ * main(int a, int b) { // pos 0, pos 1
+ * int c = 1; // pos 2
+ * int d = 2; // pos 3
+ *
+ * while (a < c) {
+ * while (a < d) {
+ * }
+ * }
+ *
+ * return a-b;
+ * }
+ */
+
+#define a_pos 0
+#define b_pos 1
+#define c_pos 2
+#define d_pos 3
+
+int
+main(void)
+{
+ type *prim_t_int;
+ ir_graph *irg;
+ type *owner;
+ type *proc_main;
+ entity *ent;
+ ir_node *h1, *b1, *h2, *b2, *x, *r, *t1, *f1, *t2, *f2;
+
+ printf("\nCreating an IR graph: NESTED_PHI...\n");
+
+ init_firm (NULL);
+ // set_opt_normalize (0);
+ set_optimize(1);
+ set_opt_constant_folding(1);
+ set_opt_cse(1);
+ set_opt_dead_node_elimination (1);
+
+ prim_t_int = new_type_primitive(id_from_str ("int", 3), mode_Is);
+
+#define METHODNAME "main_tp"
+#define NRARGS 1
+#define NRES 1
+
+ proc_main = new_type_method(id_from_str(METHODNAME, strlen(METHODNAME)),
+ NRARGS, NRES);
+ set_method_param_type(proc_main, 0, prim_t_int);
+ set_method_res_type(proc_main, 0, prim_t_int);
+
+ owner = new_type_class (new_id_from_str ("NESTED_PHI"));
+ ent = new_entity (owner, new_id_from_str ("main"), proc_main);
+
+ /* Generates start and end blocks and nodes and a first, initial block */
+ irg = new_ir_graph (ent, 4);
+
+ /* Generate two values */
+ set_value (a_pos, new_Proj(get_irg_args(irg), mode_Is, 0));
+ set_value (b_pos, new_Proj(get_irg_args(irg), mode_Is, 0));
+ set_value (c_pos, new_Const (mode_Is, new_tarval_from_long (1, mode_Is)));
+ set_value (d_pos, new_Const (mode_Is, new_tarval_from_long (2, mode_Is)));
+
+ /* a block for the outer loop header and the conditional branch */
+ h1 = get_irg_current_block(irg);
+ x = new_Cond (new_Proj(new_Cmp(get_value(a_pos, mode_Is), get_value(c_pos, mode_Is)),
+ mode_b, Le));
+ f1 = new_Proj (x, mode_X, 0);
+ t1 = new_Proj (x, mode_X, 1);
+
+ /* generate the block for the loop body */
+ b1 = new_immBlock ();
+ add_in_edge (b1, t1);
+
+ /* The loop body is the head of the inner loop */
+ h2 = b1;
+ x = new_Cond (new_Proj(new_Cmp(get_value(a_pos, mode_Is), get_value(d_pos, mode_Is)),
+ mode_b, Le));
+ f2 = new_Proj (x, mode_X, 0);
+ t2 = new_Proj (x, mode_X, 1);
+ add_in_edge(h1, f2);
+ mature_block(h1);
+
+ /* The inner loop body */
+ b2 = new_immBlock ();
+ add_in_edge (b2, t2);
+ mature_block(b2);
+ x = new_Jmp();
+ add_in_edge (h2, x);
+ mature_block(h2);
+
+ /* generate the return block */
+ r = new_immBlock ();
+ add_in_edge (r, f1);
+ mature_block (r);
+
+ {
+ ir_node *in[1];
+ in[0] = new_Sub (get_value (a_pos, mode_Is), get_value (b_pos, mode_Is), mode_Is);
+
+ x = new_Return (get_store (), 1, in);
+ }
+
+ /* finalize the end block generated in new_ir_graph() */
+ add_in_edge (get_irg_end_block(irg), x);
+ mature_block (get_irg_end_block(irg));
+
+ finalize_cons (irg);
+
+ printf("Optimizing ...\n");
+
+ //local_optimize_graph(irg),
+ //dead_node_elimination(irg);
+
+ /* verify the graph */
+ irg_vrfy(irg);
+
+ /* output the vcg file */
+ printf("Done building the graph. Dumping it.\n");
+ turn_off_edge_labels();
+ dump_all_types();
+ dump_ir_block_graph (irg);
+ printf("Use xvcg to view this graph:\n");
+ printf("/ben/goetz/bin/xvcg GRAPHNAME\n\n");
+
+ return (0);
+}