scc

commit d96672c3e87b42ba8e269bd72386ee2431c3134c
parent 7ceb2bb314fb31bc01ce1781e00be4d29d38b7f3
Author: Roberto E. Vargas Caballero <k0ga@shike2.com>
Date:   Thu,  2 Jun 2016 08:14:12 +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.

Diffstat:
M
cc2/arch/qbe/code.c
 | 
4
+++-

1 file changed, 3 insertions(+), 1 deletion(-)
diff --git 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("}");
 }