[hackers] [scc] [cc2-qbe] Add initial label for qbe || Roberto E. Vargas Caballero

[git]

commit d96672c3e87b42ba8e269bd72386ee2431c3134c
Author:     Roberto E. Vargas Caballero <k...@shike2.com>
AuthorDate: Thu Jun 2 08:14:12 2016 +0200
Commit:     Roberto E. Vargas Caballero <k...@shike2.com>
CommitDate: Thu Jun 2 08:14:12 2016 +0200

    [cc2-qbe] Add initial label for qbe
    
    Qbe needs a label at the beginning of every basic block,
    but when we don't have any code inside of a function we
    does not generate any basic block. This code forces to
    have at least one basic block composed of a label and
    a jump statement.

diff --git a/cc2/arch/qbe/code.c b/cc2/arch/qbe/code.c
index 2f213c5..6e23894 100644
--- a/cc2/arch/qbe/code.c
+++ b/cc2/arch/qbe/code.c
@@ -317,7 +317,7 @@ writeout(void)
                        break;
                printf("%s%s %s.val", sep, size2asm(&p->type), symname(p));
        }
-       puts(")\n{");
+       puts(")\n{\n@.start");
 
        /* allocate stack space for parameters */
        for (p = locals; p && (p->type.flags & PARF) != 0; p = p->next)
@@ -344,6 +344,8 @@ writeout(void)
                if (pc->op)
                        (*optbl[pc->op].fun)();
        }
+       if (!prog)
+               puts("\t\tret");
 
        puts("}");
 }