harec

commit 54be90686905f02100e97fedae9657b1661e012e
parent 3c261da64c19a862a175c429937ff92ae2084030
Author: Eyal Sawady <ecs@d2evs.net>
Date:   Tue, 10 Aug 2021 09:14:06 +0000

gen: fix cast from empty array to slice

Signed-off-by: Eyal Sawady <ecs@d2evs.net>

Diffstat:
M
src/gen.c
 | 
13
+++++++++----

1 file changed, 9 insertions(+), 4 deletions(-)
diff --git a/src/gen.c b/src/gen.c
@@ -855,12 +855,17 @@ gen_expr_cast_slice_at(struct gen_context *ctx,
 	assert(from->storage == STORAGE_ARRAY);
 	assert(from->array.length != SIZE_UNDEFINED);
 
-	struct gen_value value = gen_expr(ctx, expr->cast.value);
-	struct qbe_value qvalue = mkqval(ctx, &value);
+	enum qbe_instr store = store_for_type(ctx, &builtin_type_size);
 	struct qbe_value base = mklval(ctx, &out);
 	struct qbe_value sz = constl(to->size);
-	enum qbe_instr store = store_for_type(ctx, &builtin_type_size);
-	pushi(ctx->current, NULL, store, &qvalue, &base, NULL);
+	if (from->array.length == 0) {
+		struct qbe_value tmp = constl(0);
+		pushi(ctx->current, NULL, store, &tmp, &base, NULL);
+	} else {
+		struct gen_value value = gen_expr(ctx, expr->cast.value);
+		struct qbe_value qvalue = mkqval(ctx, &value);
+		pushi(ctx->current, NULL, store, &qvalue, &base, NULL);
+	}
 	struct qbe_value qptr = mkqtmp(ctx, ctx->arch.ptr, ".%d");
 	sz = constl(builtin_type_size.size);
 	struct qbe_value ln = constl(from->array.length);