[vala/wip/transform: 49/52] Fix unary expression and active locals

[Rico Tzschichholz <ricotz src gnome org>]

commit fc2bc3a9fdb1541a828c4278c232693e1f6900b0
Author: Luca Bruno <lucabru src gnome org>
Date:   Sat Feb 25 21:25:57 2012 +0100

    Fix unary expression and active locals

 codegen/valaccodetransformer.vala |   49 +++++++++++++++++++++++++++++++++++-
 vala/valablock.vala               |   11 +++++++-
 vala/valaunaryexpression.vala     |    9 +------
 3 files changed, 58 insertions(+), 11 deletions(-)
---
diff --git a/codegen/valaccodetransformer.vala b/codegen/valaccodetransformer.vala
index 837f4fa..fed7072 100644
--- a/codegen/valaccodetransformer.vala
+++ b/codegen/valaccodetransformer.vala
@@ -1,6 +1,6 @@
 /* valaccodetransformer.vala
  *
- * Copyright (C) 2011  Luca Bruno
+ * Copyright (C) 2012  Luca Bruno
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
@@ -105,7 +105,21 @@ public class Vala.CCodeTransformer : CodeTransformer {
 	}
 
 	public override void visit_block (Block b) {
+		foreach (LocalVariable local in b.get_local_variables ()) {
+			local.active = true;
+		}
+		foreach (Constant constant in b.get_local_constants ()) {
+			constant.active = true;
+		}
+
 		b.accept_children (this);
+
+		foreach (LocalVariable local in b.get_local_variables ()) {
+			local.active = false;
+		}
+		foreach (Constant constant in b.get_local_constants ()) {
+			constant.active = false;
+		}
 	}
 
 	public override void visit_declaration_statement (DeclarationStatement stmt) {
@@ -164,8 +178,8 @@ public class Vala.CCodeTransformer : CodeTransformer {
 				b.open_if (new UnaryExpression (UnaryOperator.LOGICAL_NEGATION, stmt.condition, stmt.condition.source_reference));
 				b.add_break ();
 				b.close ();
-				b.add_statement (stmt.body);
 			}
+			b.add_statement (stmt.body);
 			b.close ();
 		}
 
@@ -458,6 +472,37 @@ public class Vala.CCodeTransformer : CodeTransformer {
 		}
 	}
 
+	public override void visit_unary_expression (UnaryExpression expr) {
+		var parent_statement = expr.parent_statement;
+		if (parent_statement == null) {
+			base.visit_unary_expression (expr);
+			return;
+		}
+
+		if (expr.operator == UnaryOperator.INCREMENT || expr.operator == UnaryOperator.DECREMENT) {
+			var old_parent_node = expr.parent_node;
+			var target_type = expr.target_type != null ? expr.target_type.copy () : null;
+
+			push_builder (new CodeBuilder (context, parent_statement, expr.source_reference));
+			Expression replacement;
+			if (expr.operator == UnaryOperator.INCREMENT) {
+				replacement = expression (@"$(expr.inner) = $(expr.inner) + 1");
+			} else {
+				replacement = expression (@"$(expr.inner) = $(expr.inner) - 1");
+			}
+			replacement.target_type = target_type;
+			context.analyzer.replaced_nodes.add (expr);
+			old_parent_node.replace_expression (expr, replacement);
+			b.check (this);
+
+			pop_builder ();
+			check (replacement);
+			return;
+		}
+
+		base.visit_unary_expression (expr);
+	}
+
 	public override void visit_object_creation_expression (ObjectCreationExpression expr) {
 		if (expr.tree_can_fail) {
 			if (expr.parent_node is LocalVariable || expr.parent_node is ExpressionStatement) {
diff --git a/vala/valablock.vala b/vala/valablock.vala
index 81e9d35..488c499 100644
--- a/vala/valablock.vala
+++ b/vala/valablock.vala
@@ -107,7 +107,7 @@ public class Vala.Block : Symbol, Statement {
 	}
 
 	/**
-	 * Returns a copy of the list of local variables.
+	 * Returns the list of local variables.
 	 *
 	 * @return variable declarator list
 	 */
@@ -115,6 +115,15 @@ public class Vala.Block : Symbol, Statement {
 		return local_variables;
 	}
 
+	/**
+	 * Returns the list of local constants.
+	 *
+	 * @return variable declarator list
+	 */
+	public List<Constant> get_local_constants () {
+		return local_constants;
+	}
+
 	public void add_local_constant (Constant constant) {
 		var parent_block = parent_symbol;
 		while (parent_block is Block || parent_block is Method || parent_block is PropertyAccessor) {
diff --git a/vala/valaunaryexpression.vala b/vala/valaunaryexpression.vala
index 11c3bb4..f090b97 100644
--- a/vala/valaunaryexpression.vala
+++ b/vala/valaunaryexpression.vala
@@ -215,14 +215,7 @@ public class Vala.UnaryExpression : Expression {
 				return false;
 			}
 
-			var old_value = new MemberAccess (ma.inner, ma.member_name, inner.source_reference);
-			var bin = new BinaryExpression (operator == UnaryOperator.INCREMENT ? BinaryOperator.PLUS : BinaryOperator.MINUS, old_value, new IntegerLiteral ("1"), source_reference);
-
-			var assignment = new Assignment (ma, bin, AssignmentOperator.SIMPLE, source_reference);
-			assignment.target_type = target_type;
-			context.analyzer.replaced_nodes.add (this);
-			parent_node.replace_expression (this, assignment);
-			assignment.check (context);
+			value_type = inner.value_type.copy ();
 			return true;
 		} else if (operator == UnaryOperator.REF || operator == UnaryOperator.OUT) {
 			var ea = inner as ElementAccess;