1 /* Copyright (C) 1998 - 2000 by Universitaet Karlsruhe
4 * Authors: Christian Schaefer, Goetz Lindenmaier
16 * An Firm program to test float values.
18 * This file constructs the ir for the following pseudo-program:
27 int main(int argc, char **argv)
29 ir_graph *irg; /* this variable contains the irgraph */
30 type *owner; /* the class in which this method is defined */
31 type *proc_main; /* type information for the method main */
33 entity *ent; /* represents this method as entity of owner */
34 ir_node *x; /* to build control flow */
37 printf("\nCreating an IR graph: EMPTY...\n");
42 /** Build type information for the procedure. **/
44 /* FIRM was designed for oo languages where all methods belong to a class.
45 * For imperative languages like C we view a file as a large class containing
46 * all functions in this file as methods.
47 * This clas is generated automatically.
49 owner = get_glob_type();
51 #define METHODNAME "main"
54 /* The type of the method */
55 prim_t_dbl = new_type_primitive(id_from_str ("dbl", 3), mode_D);
56 proc_main = new_type_method(id_from_str(METHODNAME, strlen(METHODNAME)),
58 set_method_res_type(proc_main, 0, prim_t_dbl);
60 /* An entity representing the method. Owner of the entity is the global class
61 type mentioned above. */
62 ent = new_entity ((type *)owner,
63 id_from_str (METHODNAME, strlen(METHODNAME)),
66 /** Build code for the procedure. **/
68 /* Generates the basic graph for the method represented by entity ent, that
69 * is, generates start and end blocks and nodes and a first, initial block.
70 * The constructor needs to know the number of local variables (including
71 * the arguments) in the method.
73 #define NUM_OF_LOCAL_VARS 0
74 irg = new_ir_graph (ent, NUM_OF_LOCAL_VARS);
76 tv = new_tarval_from_str ("12345678901234567890.1234567890", 31, mode_D);
82 ir_node *in[1]; /* this is the array containing the return parameters */
83 in[0] = new_Const(mode_D, tv);
84 x = new_Return (get_store(), 1, in);
86 /* Now we generated all instructions for this block and all its predecessor
87 * blocks so we can mature it. (There are not too much.) */
88 mature_block (get_irg_current_block(irg));
90 /* This adds the in edge of the end block which originates at the return statement.
91 * The return node passes controlflow to the end block. */
92 add_in_edge (get_irg_end_block(irg), x);
93 /* Now we can mature the end block as all it's predecessors are known. */
94 mature_block (get_irg_end_block(irg));
96 /* Verify the graph. Finds some very bad errors in the graph. */
100 printf("Done building the graph. Dumping it.\n");
101 dump_ir_block_graph (irg);
103 printf("use xvcg to view this graph:\n");
104 printf("/ben/goetz/bin/xvcg GRAPHNAME\n\n");