[vala/wip/transform: 43/93] Split CodeTransformer into CCodeTransformer

[Rico Tzschichholz <ricotz src gnome org>]

commit 6d517ac81b8ec640f4ddde0648ff326bf7eef73c
Author: Luca Bruno <lucabru src gnome org>
Date:   Wed Jan 4 19:38:09 2012 +0100

    Split CodeTransformer into CCodeTransformer

 codegen/Makefile.am                  |   1 +
 codegen/valaccodetransformer.vala    | 444 +++++++++++++++++++++++++++++++++++
 codegen/valagvarianttransformer.vala |   2 +-
 vala/valacodetransformer.vala        | 417 --------------------------------
 4 files changed, 446 insertions(+), 418 deletions(-)
---
diff --git a/codegen/Makefile.am b/codegen/Makefile.am
index 234900661..66eb186de 100644
--- a/codegen/Makefile.am
+++ b/codegen/Makefile.am
@@ -35,6 +35,7 @@ libvalaccodegen_la_VALASOURCES = \
        valaccodemethodcallmodule.vala \
        valaccodemethodmodule.vala \
        valaccodestructmodule.vala \
+       valaccodetransformer.vala \
        valaclassregisterfunction.vala \
        valactype.vala \
        valaenumregisterfunction.vala \
diff --git a/codegen/valaccodetransformer.vala b/codegen/valaccodetransformer.vala
new file mode 100644
index 000000000..ff7d29d8d
--- /dev/null
+++ b/codegen/valaccodetransformer.vala
@@ -0,0 +1,444 @@
+/* valaccodetransformer.vala
+ *
+ * Copyright (C) 2011  Luca Bruno
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
+ *
+ * Author:
+ *     Luca Bruno <lucabru src gnome org>
+ */
+
+/**
+ * Code visitor for simplyfing the code tree for the C codegen.
+ */
+public class Vala.CCodeTransformer : CodeTransformer {
+       public override void visit_source_file (SourceFile source_file) {
+               source_file.accept_children (this);
+       }
+
+       public override void visit_namespace (Namespace ns) {
+               ns.accept_children (this);
+       }
+
+       public override void visit_class (Class cl) {
+               cl.accept_children (this);
+       }
+
+       public override void visit_struct (Struct st) {
+               st.accept_children (this);
+       }
+
+       public override void visit_interface (Interface iface) {
+               iface.accept_children (this);
+       }
+
+       public override void visit_enum (Enum en) {
+               en.accept_children (this);
+       }
+
+       public override void visit_enum_value (EnumValue ev) {
+               ev.accept_children (this);
+       }
+
+       public override void visit_error_domain (ErrorDomain edomain) {
+               edomain.accept_children (this);
+       }
+
+       public override void visit_error_code (ErrorCode ecode) {
+               ecode.accept_children (this);
+       }
+
+       public override void visit_delegate (Delegate d) {
+               d.accept_children (this);
+       }
+
+       public override void visit_constant (Constant c) {
+               c.accept_children (this);
+       }
+
+       public override void visit_field (Field f) {
+               f.accept_children (this);
+       }
+
+       public override void visit_method (Method m) {
+               m.accept_children (this);
+       }
+
+       public override void visit_creation_method (CreationMethod m) {
+               m.accept_children (this);
+       }
+
+       public override void visit_formal_parameter (Parameter p) {
+               p.accept_children (this);
+       }
+
+       public override void visit_property (Property prop) {
+               prop.accept_children (this);
+       }
+
+       public override void visit_property_accessor (PropertyAccessor acc) {
+               acc.accept_children (this);
+       }
+
+       public override void visit_signal (Signal sig) {
+               sig.accept_children (this);
+       }
+
+       public override void visit_constructor (Constructor c) {
+               c.accept_children (this);
+       }
+
+       public override void visit_destructor (Destructor d) {
+               d.accept_children (this);
+       }
+
+       public override void visit_block (Block b) {
+               b.accept_children (this);
+       }
+
+       public override void visit_declaration_statement (DeclarationStatement stmt) {
+               stmt.accept_children (this);
+       }
+
+       public override void visit_local_variable (LocalVariable local) {
+               local.accept_children (this);
+       }
+
+       public override void visit_initializer_list (InitializerList list) {
+               list.accept_children (this);
+       }
+
+       public override void visit_expression_statement (ExpressionStatement stmt) {
+               stmt.accept_children (this);
+       }
+
+       public override void visit_if_statement (IfStatement stmt) {
+               stmt.accept_children (this);
+       }
+
+       public override void visit_switch_statement (SwitchStatement stmt) {
+               stmt.accept_children (this);
+       }
+
+       public override void visit_switch_section (SwitchSection section) {
+               section.accept_children (this);
+       }
+
+       public override void visit_switch_label (SwitchLabel label) {
+               label.accept_children (this);
+       }
+
+       bool always_true (Expression condition) {
+               var literal = condition as BooleanLiteral;
+               return (literal != null && literal.value);
+       }
+
+       bool always_false (Expression condition) {
+               var literal = condition as BooleanLiteral;
+               return (literal != null && !literal.value);
+       }
+
+       public override void visit_loop (Loop loop) {
+               loop.accept_children (this);
+       }
+
+       public override void visit_while_statement (WhileStatement stmt) {
+               // convert to simple loop
+
+               if (always_true (stmt.condition)) {
+                       // do not generate if block if condition is always true
+               } else if (always_false (stmt.condition)) {
+                       // do not generate if block if condition is always false
+                       stmt.body.insert_statement (0, new BreakStatement (stmt.condition.source_reference));
+               } else {
+                       var if_condition = new UnaryExpression (UnaryOperator.LOGICAL_NEGATION, 
stmt.condition, stmt.condition.source_reference);
+                       var true_block = new Block (stmt.condition.source_reference);
+                       true_block.add_statement (new BreakStatement (stmt.condition.source_reference));
+                       var if_stmt = new IfStatement (if_condition, true_block, null, 
stmt.condition.source_reference);
+                       stmt.body.insert_statement (0, if_stmt);
+               }
+
+               var loop = new Loop (stmt.body, stmt.source_reference);
+
+               var parent_block = (Block) stmt.parent_node;
+               context.analyzer.replaced_nodes.add (stmt);
+               parent_block.replace_statement (stmt, loop);
+
+               stmt.body.checked = false;
+               check (loop);
+       }
+
+       public override void visit_do_statement (DoStatement stmt) {
+               // convert to simple loop
+
+               // do not generate variable and if block if condition is always true
+               if (always_true (stmt.condition)) {
+                       var loop = new Loop (stmt.body, stmt.source_reference);
+
+                       var parent_block = (Block) stmt.parent_node;
+                       context.analyzer.replaced_nodes.add (stmt);
+                       parent_block.replace_statement (stmt, loop);
+
+                       check (loop);
+                       return;
+               }
+
+               var block = new Block (stmt.source_reference);
+
+               var first_local = new LocalVariable (context.analyzer.bool_type.copy (), stmt.get_temp_name 
(), new BooleanLiteral (true, stmt.source_reference), stmt.source_reference);
+               block.add_statement (new DeclarationStatement (first_local, stmt.source_reference));
+
+               var if_condition = new UnaryExpression (UnaryOperator.LOGICAL_NEGATION, stmt.condition, 
stmt.condition.source_reference);
+               var true_block = new Block (stmt.condition.source_reference);
+               true_block.add_statement (new BreakStatement (stmt.condition.source_reference));
+               var if_stmt = new IfStatement (if_condition, true_block, null, 
stmt.condition.source_reference);
+
+               var condition_block = new Block (stmt.condition.source_reference);
+               condition_block.add_statement (if_stmt);
+
+               var first_if = new IfStatement (new UnaryExpression (UnaryOperator.LOGICAL_NEGATION, new 
MemberAccess.simple (first_local.name, stmt.source_reference), stmt.source_reference), condition_block, null, 
stmt.source_reference);
+               stmt.body.insert_statement (0, first_if);
+               var first_assign = new ExpressionStatement (new Assignment (new MemberAccess.simple 
(first_local.name, stmt.source_reference), new BooleanLiteral (false, stmt.source_reference), 
AssignmentOperator.SIMPLE, stmt.source_reference), stmt.source_reference);
+               stmt.body.insert_statement (1, first_assign);
+
+               block.add_statement (new Loop (stmt.body, stmt.source_reference));
+
+               var parent_block = (Block) stmt.parent_node;
+               context.analyzer.replaced_nodes.add (stmt);
+               parent_block.replace_statement (stmt, block);
+
+               stmt.body.checked = false;
+               check (block);
+       }
+
+       public override void visit_for_statement (ForStatement stmt) {
+               // convert to simple loop
+
+               var block = new Block (stmt.source_reference);
+
+               // initializer
+               foreach (var init_expr in stmt.get_initializer ()) {
+                       block.add_statement (new ExpressionStatement (init_expr, init_expr.source_reference));
+               }
+
+               // do not generate if block if condition is always true
+               if (stmt.condition == null || always_true (stmt.condition)) {
+               } else if (always_false (stmt.condition)) {
+                       // do not generate if block if condition is always false
+                       stmt.body.insert_statement (0, new BreakStatement (stmt.condition.source_reference));
+               } else {
+                       // condition
+                       var if_condition = new UnaryExpression (UnaryOperator.LOGICAL_NEGATION, 
stmt.condition, stmt.condition.source_reference);
+                       var true_block = new Block (stmt.condition.source_reference);
+                       true_block.add_statement (new BreakStatement (stmt.condition.source_reference));
+                       var if_stmt = new IfStatement (if_condition, true_block, null, 
stmt.condition.source_reference);
+                       stmt.body.insert_statement (0, if_stmt);
+               }
+
+               // iterator
+               var first_local = new LocalVariable (context.analyzer.bool_type.copy (), stmt.get_temp_name 
(), new BooleanLiteral (true, stmt.source_reference), stmt.source_reference);
+               block.add_statement (new DeclarationStatement (first_local, stmt.source_reference));
+
+               var iterator_block = new Block (stmt.source_reference);
+               foreach (var it_expr in stmt.get_iterator ()) {
+                       iterator_block.add_statement (new ExpressionStatement (it_expr, 
it_expr.source_reference));
+               }
+
+               var first_if = new IfStatement (new UnaryExpression (UnaryOperator.LOGICAL_NEGATION, new 
MemberAccess.simple (first_local.name, stmt.source_reference), stmt.source_reference), iterator_block, null, 
stmt.source_reference);
+               stmt.body.insert_statement (0, first_if);
+               stmt.body.insert_statement (1, new ExpressionStatement (new Assignment (new 
MemberAccess.simple (first_local.name, stmt.source_reference), new BooleanLiteral (false, 
stmt.source_reference), AssignmentOperator.SIMPLE, stmt.source_reference), stmt.source_reference));
+
+               block.add_statement (new Loop (stmt.body, stmt.source_reference));
+
+               var parent_block = (Block) stmt.parent_node;
+               context.analyzer.replaced_nodes.add (stmt);
+               parent_block.replace_statement (stmt, block);
+
+               stmt.body.checked = false;
+               check (block);
+       }
+
+       public override void visit_foreach_statement (ForeachStatement stmt) {
+               push_builder (new CodeBuilder (context, stmt, stmt.source_reference));
+               var collection = b.add_temp_declaration (stmt.collection.value_type, stmt.collection);
+
+               stmt.body.remove_local_variable (stmt.element_variable);
+               stmt.element_variable.checked = false;
+               var decl = new DeclarationStatement (stmt.element_variable, 
stmt.element_variable.source_reference);
+
+               switch (stmt.foreach_iteration) {
+               case ForeachIteration.ARRAY:
+               case ForeachIteration.GVALUE_ARRAY:
+                       // array or GValueArray
+                       var array = collection;
+                       if (stmt.foreach_iteration == ForeachIteration.GVALUE_ARRAY) {
+                               array = collection+".values";
+                       }
+                       var i = b.add_temp_declaration (null, expression ("0"));
+                       b.open_for (null, expression (@"$i < $array.length"), expression (@"$i++"));
+                       stmt.element_variable.initializer = expression (@"$array[$i]");
+                       break;
+               case ForeachIteration.GLIST:
+                       // GList or GSList
+                       b.open_for (null, expression (@"$collection != null"), expression (@"$collection = 
$collection.next"));
+                       stmt.element_variable.initializer = expression (@"$collection.data");
+                       break;
+               case ForeachIteration.INDEX:
+                       // get()+size
+                       var size = b.add_temp_declaration (null, expression (@"$collection.size"));
+                       var i = b.add_temp_declaration (null, expression ("0"));
+                       b.open_for (null, expression (@"$i < $size"), expression (@"$i++"));
+                       stmt.element_variable.initializer = expression (@"$collection.get ($i)");
+                       break;
+               case ForeachIteration.NEXT_VALUE:
+                       // iterator+next_value()
+                       var iterator = b.add_temp_declaration (null, expression (@"$collection.iterator ()"));
+                       var temp = b.add_temp_declaration (stmt.type_reference);
+                       b.open_while (expression (@"($temp = $iterator.next_value ()) != null"));
+                       stmt.element_variable.initializer = expression (temp);
+                       break;
+               case ForeachIteration.NEXT_GET:
+                       // iterator+next()+get()
+                       var iterator = b.add_temp_declaration (null, expression (@"$collection.iterator ()"));
+                       b.open_while (expression (@"$iterator.next ()"));
+                       stmt.element_variable.initializer = expression (@"$iterator.get ()");
+                       break;
+               default:
+                       assert_not_reached ();
+               }
+
+               stmt.body.insert_statement (0, decl);
+               b.add_statement (stmt.body);
+               b.close ();
+
+               var parent_block = context.analyzer.get_current_block (stmt);
+               context.analyzer.replaced_nodes.add (stmt);
+               parent_block.replace_statement (stmt, new EmptyStatement (stmt.source_reference));
+
+               stmt.body.checked = false;
+               b.check (this);
+               pop_builder ();
+       }
+
+       public override void visit_break_statement (BreakStatement stmt) {
+               stmt.accept_children (this);
+       }
+
+       public override void visit_continue_statement (ContinueStatement stmt) {
+               stmt.accept_children (this);
+       }
+
+       public override void visit_return_statement (ReturnStatement stmt) {
+               stmt.accept_children (this);
+       }
+
+       public override void visit_yield_statement (YieldStatement stmt) {
+               stmt.accept_children (this);
+       }
+
+       public override void visit_throw_statement (ThrowStatement stmt) {
+               stmt.accept_children (this);
+       }
+
+       public override void visit_try_statement (TryStatement stmt) {
+               stmt.accept_children (this);
+       }
+
+       public override void visit_catch_clause (CatchClause clause) {
+               clause.accept_children (this);
+       }
+
+       public override void visit_lock_statement (LockStatement stmt) {
+               stmt.accept_children (this);
+       }
+
+       public override void visit_unlock_statement (UnlockStatement stmt) {
+               stmt.accept_children (this);
+       }
+
+       public override void visit_delete_statement (DeleteStatement stmt) {
+               stmt.accept_children (this);
+       }
+
+       public override void visit_expression (Expression expr) {
+               expr.accept_children (this);
+       }
+
+       public override void visit_method_call (MethodCall expr) {
+               if (expr.tree_can_fail) {
+                       if (expr.parent_node is LocalVariable || expr.parent_node is ExpressionStatement) {
+                               // simple statements, no side effects after method call
+                       } else if (!(context.analyzer.get_current_non_local_symbol (expr) is Block)) {
+                               // can't handle errors in field initializers
+                               Report.error (expr.source_reference, "Field initializers must not throw 
errors");
+                       } else {
+                               // store parent_node as we need to replace the expression in the old parent 
node later on
+                               var old_parent_node = expr.parent_node;
+
+                               var local = new LocalVariable (expr.value_type, expr.get_temp_name (), null, 
expr.source_reference);
+                               var decl = new DeclarationStatement (local, expr.source_reference);
+
+                               expr.insert_statement (context.analyzer.get_current_block (expr), decl);
+
+
+                               // don't set initializer earlier as this changes parent_node and 
parent_statement
+                               local.initializer = expr;
+                               check (decl);
+
+                               var temp_access = SemanticAnalyzer.create_temp_access (local, 
expr.target_type);
+
+                               // move temp variable to insert block to ensure
+                               // variable is in the same block as the declarat
+                               // otherwise there will be scoping issues in the
+                               var block = context.analyzer.get_current_block (expr);
+                               block.remove_local_variable (local);
+                               context.analyzer.get_current_block (expr).add_local_variable (local);
+
+                               context.analyzer.replaced_nodes.add (expr);
+                               old_parent_node.replace_expression (expr, temp_access);
+                               check (temp_access);
+                       }
+               }
+       }
+
+       public override void visit_conditional_expression (ConditionalExpression expr) {
+               // convert to if statement
+
+               var local = new LocalVariable (expr.value_type, expr.get_temp_name (), null, 
expr.source_reference);
+               var decl = new DeclarationStatement (local, expr.source_reference);
+               expr.insert_statement (context.analyzer.get_current_block (expr), decl);
+               check (decl);
+
+               var true_stmt = new ExpressionStatement (new Assignment (new MemberAccess.simple (local.name, 
expr.true_expression.source_reference), expr.true_expression, AssignmentOperator.SIMPLE, 
expr.true_expression.source_reference), expr.true_expression.source_reference);
+               var true_block = new Block (expr.true_expression.source_reference);
+               true_block.add_statement (true_stmt);
+
+               var false_stmt = new ExpressionStatement (new Assignment (new MemberAccess.simple 
(local.name, expr.false_expression.source_reference), expr.false_expression, AssignmentOperator.SIMPLE, 
expr.false_expression.source_reference), expr.false_expression.source_reference);
+               var false_block = new Block (expr.false_expression.source_reference);
+               false_block.add_statement (false_stmt);
+
+               var if_stmt = new IfStatement (expr.condition, true_block, false_block, 
expr.source_reference);
+               expr.insert_statement (context.analyzer.get_current_block (expr), if_stmt);
+               check (if_stmt);
+
+               var ma = new MemberAccess.simple (local.name, expr.source_reference);
+               ma.formal_target_type = expr.formal_target_type;
+               ma.target_type = expr.target_type;
+
+               context.analyzer.replaced_nodes.add (expr);
+               expr.parent_node.replace_expression (expr, ma);
+               check (ma);
+       }
+}
diff --git a/codegen/valagvarianttransformer.vala b/codegen/valagvarianttransformer.vala
index 500cff25c..037ace33a 100644
--- a/codegen/valagvarianttransformer.vala
+++ b/codegen/valagvarianttransformer.vala
@@ -23,7 +23,7 @@
 /**
  * Code visitor for transforming the code tree related to GVariant.
  */
-public class Vala.GVariantTransformer : CodeTransformer {
+public class Vala.GVariantTransformer : CCodeTransformer {
        struct BasicTypeInfo {
                public unowned string signature;
                public unowned string type_name;
diff --git a/vala/valacodetransformer.vala b/vala/valacodetransformer.vala
index 064165580..02728faec 100644
--- a/vala/valacodetransformer.vala
+++ b/vala/valacodetransformer.vala
@@ -117,421 +117,4 @@ public class Vala.CodeTransformer : CodeVisitor {
                }
                node.accept (this);
        }
-
-       public override void visit_source_file (SourceFile source_file) {
-               source_file.accept_children (this);
-       }
-
-       public override void visit_namespace (Namespace ns) {
-               ns.accept_children (this);
-       }
-
-       public override void visit_class (Class cl) {
-               cl.accept_children (this);
-       }
-
-       public override void visit_struct (Struct st) {
-               st.accept_children (this);
-       }
-
-       public override void visit_interface (Interface iface) {
-               iface.accept_children (this);
-       }
-
-       public override void visit_enum (Enum en) {
-               en.accept_children (this);
-       }
-
-       public override void visit_enum_value (EnumValue ev) {
-               ev.accept_children (this);
-       }
-
-       public override void visit_error_domain (ErrorDomain edomain) {
-               edomain.accept_children (this);
-       }
-
-       public override void visit_error_code (ErrorCode ecode) {
-               ecode.accept_children (this);
-       }
-
-       public override void visit_delegate (Delegate d) {
-               d.accept_children (this);
-       }
-
-       public override void visit_constant (Constant c) {
-               c.accept_children (this);
-       }
-
-       public override void visit_field (Field f) {
-               f.accept_children (this);
-       }
-
-       public override void visit_method (Method m) {
-               m.accept_children (this);
-       }
-
-       public override void visit_creation_method (CreationMethod m) {
-               m.accept_children (this);
-       }
-
-       public override void visit_formal_parameter (Parameter p) {
-               p.accept_children (this);
-       }
-
-       public override void visit_property (Property prop) {
-               prop.accept_children (this);
-       }
-
-       public override void visit_property_accessor (PropertyAccessor acc) {
-               acc.accept_children (this);
-       }
-
-       public override void visit_signal (Signal sig) {
-               sig.accept_children (this);
-       }
-
-       public override void visit_constructor (Constructor c) {
-               c.accept_children (this);
-       }
-
-       public override void visit_destructor (Destructor d) {
-               d.accept_children (this);
-       }
-
-       public override void visit_block (Block b) {
-               b.accept_children (this);
-       }
-
-       public override void visit_declaration_statement (DeclarationStatement stmt) {
-               stmt.accept_children (this);
-       }
-
-       public override void visit_local_variable (LocalVariable local) {
-               local.accept_children (this);
-       }
-
-       public override void visit_initializer_list (InitializerList list) {
-               list.accept_children (this);
-       }
-
-       public override void visit_expression_statement (ExpressionStatement stmt) {
-               stmt.accept_children (this);
-       }
-
-       public override void visit_if_statement (IfStatement stmt) {
-               stmt.accept_children (this);
-       }
-
-       public override void visit_switch_statement (SwitchStatement stmt) {
-               stmt.accept_children (this);
-       }
-
-       public override void visit_switch_section (SwitchSection section) {
-               section.accept_children (this);
-       }
-
-       public override void visit_switch_label (SwitchLabel label) {
-               label.accept_children (this);
-       }
-
-       bool always_true (Expression condition) {
-               var literal = condition as BooleanLiteral;
-               return (literal != null && literal.value);
-       }
-
-       bool always_false (Expression condition) {
-               var literal = condition as BooleanLiteral;
-               return (literal != null && !literal.value);
-       }
-
-       public override void visit_loop (Loop loop) {
-               loop.accept_children (this);
-       }
-
-       public override void visit_while_statement (WhileStatement stmt) {
-               // convert to simple loop
-
-               if (always_true (stmt.condition)) {
-                       // do not generate if block if condition is always true
-               } else if (always_false (stmt.condition)) {
-                       // do not generate if block if condition is always false
-                       stmt.body.insert_statement (0, new BreakStatement (stmt.condition.source_reference));
-               } else {
-                       var if_condition = new UnaryExpression (UnaryOperator.LOGICAL_NEGATION, 
stmt.condition, stmt.condition.source_reference);
-                       var true_block = new Block (stmt.condition.source_reference);
-                       true_block.add_statement (new BreakStatement (stmt.condition.source_reference));
-                       var if_stmt = new IfStatement (if_condition, true_block, null, 
stmt.condition.source_reference);
-                       stmt.body.insert_statement (0, if_stmt);
-               }
-
-               var loop = new Loop (stmt.body, stmt.source_reference);
-
-               var parent_block = (Block) stmt.parent_node;
-               context.analyzer.replaced_nodes.add (stmt);
-               parent_block.replace_statement (stmt, loop);
-
-               stmt.body.checked = false;
-               check (loop);
-       }
-
-       public override void visit_do_statement (DoStatement stmt) {
-               // convert to simple loop
-
-               // do not generate variable and if block if condition is always true
-               if (always_true (stmt.condition)) {
-                       var loop = new Loop (stmt.body, stmt.source_reference);
-
-                       var parent_block = (Block) stmt.parent_node;
-                       context.analyzer.replaced_nodes.add (stmt);
-                       parent_block.replace_statement (stmt, loop);
-
-                       check (loop);
-                       return;
-               }
-
-               var block = new Block (stmt.source_reference);
-
-               var first_local = new LocalVariable (context.analyzer.bool_type.copy (), stmt.get_temp_name 
(), new BooleanLiteral (true, stmt.source_reference), stmt.source_reference);
-               block.add_statement (new DeclarationStatement (first_local, stmt.source_reference));
-
-               var if_condition = new UnaryExpression (UnaryOperator.LOGICAL_NEGATION, stmt.condition, 
stmt.condition.source_reference);
-               var true_block = new Block (stmt.condition.source_reference);
-               true_block.add_statement (new BreakStatement (stmt.condition.source_reference));
-               var if_stmt = new IfStatement (if_condition, true_block, null, 
stmt.condition.source_reference);
-
-               var condition_block = new Block (stmt.condition.source_reference);
-               condition_block.add_statement (if_stmt);
-
-               var first_if = new IfStatement (new UnaryExpression (UnaryOperator.LOGICAL_NEGATION, new 
MemberAccess.simple (first_local.name, stmt.source_reference), stmt.source_reference), condition_block, null, 
stmt.source_reference);
-               stmt.body.insert_statement (0, first_if);
-               var first_assign = new ExpressionStatement (new Assignment (new MemberAccess.simple 
(first_local.name, stmt.source_reference), new BooleanLiteral (false, stmt.source_reference), 
AssignmentOperator.SIMPLE, stmt.source_reference), stmt.source_reference);
-               stmt.body.insert_statement (1, first_assign);
-
-               block.add_statement (new Loop (stmt.body, stmt.source_reference));
-
-               var parent_block = (Block) stmt.parent_node;
-               context.analyzer.replaced_nodes.add (stmt);
-               parent_block.replace_statement (stmt, block);
-
-               stmt.body.checked = false;
-               check (block);
-       }
-
-       public override void visit_for_statement (ForStatement stmt) {
-               // convert to simple loop
-
-               var block = new Block (stmt.source_reference);
-
-               // initializer
-               foreach (var init_expr in stmt.get_initializer ()) {
-                       block.add_statement (new ExpressionStatement (init_expr, init_expr.source_reference));
-               }
-
-               // do not generate if block if condition is always true
-               if (stmt.condition == null || always_true (stmt.condition)) {
-               } else if (always_false (stmt.condition)) {
-                       // do not generate if block if condition is always false
-                       stmt.body.insert_statement (0, new BreakStatement (stmt.condition.source_reference));
-               } else {
-                       // condition
-                       var if_condition = new UnaryExpression (UnaryOperator.LOGICAL_NEGATION, 
stmt.condition, stmt.condition.source_reference);
-                       var true_block = new Block (stmt.condition.source_reference);
-                       true_block.add_statement (new BreakStatement (stmt.condition.source_reference));
-                       var if_stmt = new IfStatement (if_condition, true_block, null, 
stmt.condition.source_reference);
-                       stmt.body.insert_statement (0, if_stmt);
-               }
-
-               // iterator
-               var first_local = new LocalVariable (context.analyzer.bool_type.copy (), stmt.get_temp_name 
(), new BooleanLiteral (true, stmt.source_reference), stmt.source_reference);
-               block.add_statement (new DeclarationStatement (first_local, stmt.source_reference));
-
-               var iterator_block = new Block (stmt.source_reference);
-               foreach (var it_expr in stmt.get_iterator ()) {
-                       iterator_block.add_statement (new ExpressionStatement (it_expr, 
it_expr.source_reference));
-               }
-
-               var first_if = new IfStatement (new UnaryExpression (UnaryOperator.LOGICAL_NEGATION, new 
MemberAccess.simple (first_local.name, stmt.source_reference), stmt.source_reference), iterator_block, null, 
stmt.source_reference);
-               stmt.body.insert_statement (0, first_if);
-               stmt.body.insert_statement (1, new ExpressionStatement (new Assignment (new 
MemberAccess.simple (first_local.name, stmt.source_reference), new BooleanLiteral (false, 
stmt.source_reference), AssignmentOperator.SIMPLE, stmt.source_reference), stmt.source_reference));
-
-               block.add_statement (new Loop (stmt.body, stmt.source_reference));
-
-               var parent_block = (Block) stmt.parent_node;
-               context.analyzer.replaced_nodes.add (stmt);
-               parent_block.replace_statement (stmt, block);
-
-               stmt.body.checked = false;
-               check (block);
-       }
-
-       public override void visit_foreach_statement (ForeachStatement stmt) {
-               push_builder (new CodeBuilder (context, stmt, stmt.source_reference));
-               var collection = b.add_temp_declaration (stmt.collection.value_type, stmt.collection);
-
-               stmt.body.remove_local_variable (stmt.element_variable);
-               stmt.element_variable.checked = false;
-               var decl = new DeclarationStatement (stmt.element_variable, 
stmt.element_variable.source_reference);
-
-               switch (stmt.foreach_iteration) {
-               case ForeachIteration.ARRAY:
-               case ForeachIteration.GVALUE_ARRAY:
-                       // array or GValueArray
-                       var array = collection;
-                       if (stmt.foreach_iteration == ForeachIteration.GVALUE_ARRAY) {
-                               array = collection+".values";
-                       }
-                       var i = b.add_temp_declaration (null, expression ("0"));
-                       b.open_for (null, expression (@"$i < $array.length"), expression (@"$i++"));
-                       stmt.element_variable.initializer = expression (@"$array[$i]");
-                       break;
-               case ForeachIteration.GLIST:
-                       // GList or GSList
-                       b.open_for (null, expression (@"$collection != null"), expression (@"$collection = 
$collection.next"));
-                       stmt.element_variable.initializer = expression (@"$collection.data");
-                       break;
-               case ForeachIteration.INDEX:
-                       // get()+size
-                       var size = b.add_temp_declaration (null, expression (@"$collection.size"));
-                       var i = b.add_temp_declaration (null, expression ("0"));
-                       b.open_for (null, expression (@"$i < $size"), expression (@"$i++"));
-                       stmt.element_variable.initializer = expression (@"$collection.get ($i)");
-                       break;
-               case ForeachIteration.NEXT_VALUE:
-                       // iterator+next_value()
-                       var iterator = b.add_temp_declaration (null, expression (@"$collection.iterator ()"));
-                       var temp = b.add_temp_declaration (stmt.type_reference);
-                       b.open_while (expression (@"($temp = $iterator.next_value ()) != null"));
-                       stmt.element_variable.initializer = expression (temp);
-                       break;
-               case ForeachIteration.NEXT_GET:
-                       // iterator+next()+get()
-                       var iterator = b.add_temp_declaration (null, expression (@"$collection.iterator ()"));
-                       b.open_while (expression (@"$iterator.next ()"));
-                       stmt.element_variable.initializer = expression (@"$iterator.get ()");
-                       break;
-               default:
-                       assert_not_reached ();
-               }
-
-               stmt.body.insert_statement (0, decl);
-               b.add_statement (stmt.body);
-               b.close ();
-
-               var parent_block = context.analyzer.get_current_block (stmt);
-               context.analyzer.replaced_nodes.add (stmt);
-               parent_block.replace_statement (stmt, new EmptyStatement (stmt.source_reference));
-
-               stmt.body.checked = false;
-               b.check (this);
-               pop_builder ();
-       }
-
-       public override void visit_break_statement (BreakStatement stmt) {
-               stmt.accept_children (this);
-       }
-
-       public override void visit_continue_statement (ContinueStatement stmt) {
-               stmt.accept_children (this);
-       }
-
-       public override void visit_return_statement (ReturnStatement stmt) {
-               stmt.accept_children (this);
-       }
-
-       public override void visit_yield_statement (YieldStatement stmt) {
-               stmt.accept_children (this);
-       }
-
-       public override void visit_throw_statement (ThrowStatement stmt) {
-               stmt.accept_children (this);
-       }
-
-       public override void visit_try_statement (TryStatement stmt) {
-               stmt.accept_children (this);
-       }
-
-       public override void visit_catch_clause (CatchClause clause) {
-               clause.accept_children (this);
-       }
-
-       public override void visit_lock_statement (LockStatement stmt) {
-               stmt.accept_children (this);
-       }
-
-       public override void visit_unlock_statement (UnlockStatement stmt) {
-               stmt.accept_children (this);
-       }
-
-       public override void visit_delete_statement (DeleteStatement stmt) {
-               stmt.accept_children (this);
-       }
-
-       public override void visit_expression (Expression expr) {
-               expr.accept_children (this);
-       }
-
-       public override void visit_method_call (MethodCall expr) {
-               if (expr.tree_can_fail) {
-                       if (expr.parent_node is LocalVariable || expr.parent_node is ExpressionStatement) {
-                               // simple statements, no side effects after method call
-                       } else if (!(context.analyzer.get_current_non_local_symbol (expr) is Block)) {
-                               // can't handle errors in field initializers
-                               Report.error (expr.source_reference, "Field initializers must not throw 
errors");
-                       } else {
-                               // store parent_node as we need to replace the expression in the old parent 
node later on
-                               var old_parent_node = expr.parent_node;
-
-                               var local = new LocalVariable (expr.value_type, expr.get_temp_name (), null, 
expr.source_reference);
-                               var decl = new DeclarationStatement (local, expr.source_reference);
-
-                               expr.insert_statement (context.analyzer.get_current_block (expr), decl);
-
-                               var temp_access = SemanticAnalyzer.create_temp_access (local, 
expr.target_type);
-
-                               // don't set initializer earlier as this changes parent_node and 
parent_statement
-                               local.initializer = expr;
-                               check (decl);
-
-                               // move temp variable to insert block to ensure
-                               // variable is in the same block as the declarat
-                               // otherwise there will be scoping issues in the
-                               var block = context.analyzer.get_current_block (expr);
-                               block.remove_local_variable (local);
-                               context.analyzer.get_current_block (expr).add_local_variable (local);
-
-                               context.analyzer.replaced_nodes.add (expr);
-                               old_parent_node.replace_expression (expr, temp_access);
-                               check (temp_access);
-                       }
-               }
-       }
-
-       public override void visit_conditional_expression (ConditionalExpression expr) {
-               // convert to if statement
-
-               var local = new LocalVariable (expr.value_type, expr.get_temp_name (), null, 
expr.source_reference);
-               var decl = new DeclarationStatement (local, expr.source_reference);
-               expr.insert_statement (context.analyzer.get_current_block (expr), decl);
-               check (decl);
-
-               var true_stmt = new ExpressionStatement (new Assignment (new MemberAccess.simple (local.name, 
expr.true_expression.source_reference), expr.true_expression, AssignmentOperator.SIMPLE, 
expr.true_expression.source_reference), expr.true_expression.source_reference);
-               var true_block = new Block (expr.true_expression.source_reference);
-               true_block.add_statement (true_stmt);
-
-               var false_stmt = new ExpressionStatement (new Assignment (new MemberAccess.simple 
(local.name, expr.false_expression.source_reference), expr.false_expression, AssignmentOperator.SIMPLE, 
expr.false_expression.source_reference), expr.false_expression.source_reference);
-               var false_block = new Block (expr.false_expression.source_reference);
-               false_block.add_statement (false_stmt);
-
-               var if_stmt = new IfStatement (expr.condition, true_block, false_block, 
expr.source_reference);
-               expr.insert_statement (context.analyzer.get_current_block (expr), if_stmt);
-               check (if_stmt);
-
-               var ma = new MemberAccess.simple (local.name, expr.source_reference);
-               ma.formal_target_type = expr.formal_target_type;
-               ma.target_type = expr.target_type;
-
-               context.analyzer.replaced_nodes.add (expr);
-               expr.parent_node.replace_expression (expr, ma);
-               check (ma);
-       }
 }