[vala] Recompute length when casting between array types

[JÃrg Billeter <juergbi src gnome org>]

commit d5f417c12f02d56bc377aaacc5e7b299525586cb
Author: Simon Werbeck <simon werbeck gmail com>
Date:   Wed Jul 18 22:11:20 2012 +0200

    Recompute length when casting between array types
    
    This patch makes casting, e.g., from int[] to uchar[] work as expected
    by adjusting the array length field.
    
    Fixes bug 515408.

 codegen/valaccodebasemodule.vala |   10 ++++++++--
 1 files changed, 8 insertions(+), 2 deletions(-)
---
diff --git a/codegen/valaccodebasemodule.vala b/codegen/valaccodebasemodule.vala
index ba30e4f..a20f783 100644
--- a/codegen/valaccodebasemodule.vala
+++ b/codegen/valaccodebasemodule.vala
@@ -4917,11 +4917,17 @@ public abstract class Vala.CCodeBaseModule : CodeGenerator {
 				return;
 			}
 
-			// retain array length
+			// recompute array length when casting to other array type
 			var array_type = expr.type_reference as ArrayType;
 			if (array_type != null && expr.inner.value_type is ArrayType) {
+				var sizeof_to = new CCodeFunctionCall (new CCodeIdentifier ("sizeof"));
+				sizeof_to.add_argument (new CCodeConstant (get_ccode_name (array_type.element_type)));
+
+				var sizeof_from = new CCodeFunctionCall (new CCodeIdentifier ("sizeof"));
+				sizeof_from.add_argument (new CCodeConstant (get_ccode_name (((ArrayType) expr.inner.value_type).element_type)));
+
 				for (int dim = 1; dim <= array_type.rank; dim++) {
-					append_array_length (expr, get_array_length_cexpression (expr.inner, dim));
+					append_array_length (expr, new CCodeBinaryExpression (CCodeBinaryOperator.DIV, new CCodeBinaryExpression (CCodeBinaryOperator.MUL, get_array_length_cexpression (expr.inner, dim), sizeof_from), sizeof_to));
 				}
 			} else if (array_type != null) {
 				// cast from non-array to array, set invalid length