3 * File name: testprograms/float_example.c
5 * Author: Christian Schaefer, Goetz Lindenmaier
9 * Copyright: (c) 1999-2003 Universität Karlsruhe
10 * Licence: This file protected by GPL - GNU GENERAL PUBLIC LICENSE.
21 * An Firm program to test float values.
23 * This file constructs the ir for the following pseudo-program:
32 int main(int argc, char **argv)
34 ir_graph *irg; /* this variable contains the irgraph */
35 type *owner; /* the class in which this method is defined */
36 type *proc_main; /* type information for the method main */
38 entity *ent; /* represents this method as entity of owner */
39 ir_node *x; /* to build control flow */
42 printf("\nCreating an IR graph: FLOAT EXAMPLE...\n");
47 /** Build type information for the procedure. **/
49 /* FIRM was designed for oo languages where all methods belong to a class.
50 * For imperative languages like C we view a file as a large class containing
51 * all functions in this file as methods.
52 * This clas is generated automatically.
54 owner = get_glob_type();
56 #define METHODNAME "FLOAT_EXAMPLE_main"
59 /* The type of the method */
60 prim_t_dbl = new_type_primitive(id_from_str ("dbl", 3), mode_D);
61 proc_main = new_type_method(id_from_str(METHODNAME, strlen(METHODNAME)),
63 set_method_res_type(proc_main, 0, prim_t_dbl);
65 /* An entity representing the method. Owner of the entity is the global class
66 type mentioned above. */
67 ent = new_entity ((type *)owner,
68 id_from_str (METHODNAME, strlen(METHODNAME)),
71 /** Build code for the procedure. **/
73 /* Generates the basic graph for the method represented by entity ent, that
74 * is, generates start and end blocks and nodes and a first, initial block.
75 * The constructor needs to know the number of local variables (including
76 * the arguments) in the method.
78 #define NUM_OF_LOCAL_VARS 0
79 irg = new_ir_graph (ent, NUM_OF_LOCAL_VARS);
81 tv = new_tarval_from_str ("12345678901234567890.1234567890", 31, mode_D);
87 ir_node *in[1]; /* this is the array containing the return parameters */
88 in[0] = new_Const(mode_D, tv);
89 x = new_Return (get_store(), 1, in);
91 /* Now we generated all instructions for this block and all its predecessor
92 * blocks so we can mature it. (There are not too much.) */
93 mature_block (get_irg_current_block(irg));
95 /* This adds the in edge of the end block which originates at the return statement.
96 * The return node passes controlflow to the end block. */
97 add_in_edge (get_irg_end_block(irg), x);
98 /* Now we can mature the end block as all it's predecessors are known. */
99 mature_block (get_irg_end_block(irg));
101 /* Verify the graph. Finds some very bad errors in the graph. */
105 printf("Done building the graph. Dumping it.\n");
106 dump_ir_block_graph (irg);
108 printf("use xvcg to view this graph:\n");
109 printf("/ben/goetz/bin/xvcg GRAPHNAME\n\n");