[vala/wip/transform: 58/106] Allow floating temp variables with CodeBuilder

[Rico Tzschichholz <ricotz src gnome org>]

commit afbb2f8acd8ef1b285a29cee5a2730fa0bce5123
Author: Luca Bruno <lucabru src gnome org>
Date:   Fri Jan 6 14:11:22 2012 +0100

    Allow floating temp variables with CodeBuilder

 codegen/valaccodetransformer.vala | 170 +++++++++++++++-----------------------
 vala/valacodebuilder.vala         |   3 +-
 2 files changed, 67 insertions(+), 106 deletions(-)
---
diff --git a/codegen/valaccodetransformer.vala b/codegen/valaccodetransformer.vala
index b5dd01e06..cdbe3a279 100644
--- a/codegen/valaccodetransformer.vala
+++ b/codegen/valaccodetransformer.vala
@@ -180,92 +180,65 @@ public class Vala.CCodeTransformer : CodeTransformer {
 
        public override void visit_do_statement (DoStatement stmt) {
                // convert to simple loop
+               push_builder (new CodeBuilder (context, stmt, stmt.source_reference));
 
+               b.open_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;
+               if (!always_true (stmt.condition)) {
+                       var notfirst = b.add_temp_declaration (null, expression ("false"));
+                       b.open_if (expression (notfirst));
+                       b.open_if (new UnaryExpression (UnaryOperator.LOGICAL_NEGATION, stmt.condition, 
stmt.source_reference));
+                       b.add_break ();
+                       b.close ();
+                       b.add_else ();
+                       b.add_assignment (expression (notfirst), expression ("true"));
+                       b.close ();
                }
+               b.add_statement (stmt.body);
+               b.close ();
 
-               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;
+               var parent_block = context.analyzer.get_current_block (stmt);
                context.analyzer.replaced_nodes.add (stmt);
-               parent_block.replace_statement (stmt, block);
+               parent_block.replace_statement (stmt, new EmptyStatement (stmt.source_reference));
 
                stmt.body.checked = false;
-               check (block);
+               b.check (this);
+               pop_builder ();
        }
 
        public override void visit_for_statement (ForStatement stmt) {
                // convert to simple loop
+               push_builder (new CodeBuilder (context, stmt, stmt.source_reference));
 
                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);
+                       b.add_expression (init_expr);
                }
 
-               // 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));
+               if (stmt.condition == null || !always_false (stmt.condition)) {
+                       b.open_loop ();
+                       if (stmt.condition != null && !always_true (stmt.condition)) {
+                               b.open_if (new UnaryExpression (UnaryOperator.LOGICAL_NEGATION, 
stmt.condition, stmt.source_reference));
+                               b.add_break ();
+                               b.close ();
+                       }
+                       b.add_statement (stmt.body);
 
-               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));
+                       foreach (var it_expr in stmt.get_iterator ()) {
+                               b.add_expression (it_expr);
+                       }
+                       b.close ();
                }
 
-               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;
+               var parent_block = context.analyzer.get_current_block (stmt);
                context.analyzer.replaced_nodes.add (stmt);
-               parent_block.replace_statement (stmt, block);
+               parent_block.replace_statement (stmt, new EmptyStatement (stmt.source_reference));
 
                stmt.body.checked = false;
-               check (block);
+               b.check (this);
+               pop_builder ();
        }
 
        public override void visit_foreach_statement (ForeachStatement stmt) {
@@ -384,60 +357,47 @@ public class Vala.CCodeTransformer : CodeTransformer {
                        } 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 formal_target_type = expr.target_type != null ? expr.target_type.copy () 
: null;
+                               var target_type = expr.target_type != null ? expr.target_type.copy () : null;
+                               push_builder (new CodeBuilder (context, expr.parent_statement, 
expr.source_reference));
 
-                               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);
+                               // FIXME: use create_temp_access behavior
+                               var replacement = expression (b.add_temp_declaration (expr.value_type, expr, 
true));
 
+                               replacement.target_type = target_type;
+                               replacement.formal_target_type = formal_target_type;
                                context.analyzer.replaced_nodes.add (expr);
-                               old_parent_node.replace_expression (expr, temp_access);
-                               check (temp_access);
+                               old_parent_node.replace_expression (expr, replacement);
+                               b.check (this);
+                               pop_builder ();
+                               check (replacement);
                        }
                }
        }
 
        public override void visit_conditional_expression (ConditionalExpression expr) {
                // convert to if statement
+               Expression replacement = null;
+               var old_parent_node = expr.parent_node;
+               var formal_target_type = expr.target_type != null ? expr.target_type.copy () : null;
+               var target_type = expr.target_type != null ? expr.target_type.copy () : null;
+               push_builder (new CodeBuilder (context, expr.parent_statement, expr.source_reference));
 
-               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;
+               var result = b.add_temp_declaration (expr.value_type);
+               b.open_if (expr.condition);
+               b.add_assignment (expression (result), expr.true_expression);
+               b.add_else ();
+               b.add_assignment (expression (result), expr.false_expression);
+               b.close ();
 
+               replacement = expression (result);
+               replacement.target_type = target_type;
+               replacement.formal_target_type = formal_target_type;
                context.analyzer.replaced_nodes.add (expr);
-               expr.parent_node.replace_expression (expr, ma);
-               check (ma);
+               old_parent_node.replace_expression (expr, replacement);
+               b.check (this);
+               pop_builder ();
+               check (replacement);
        }
 
        public override void visit_binary_expression (BinaryExpression expr) {
@@ -499,7 +459,7 @@ public class Vala.CCodeTransformer : CodeTransformer {
                                push_builder (new CodeBuilder (context, expr.parent_statement, 
expr.source_reference));
 
                                // FIXME: use create_temp_access behavior
-                               var replacement = expression (b.add_temp_declaration (expr.value_type, expr));
+                               var replacement = expression (b.add_temp_declaration (expr.value_type, expr, 
true));
 
                                replacement.target_type = target_type;
                                context.analyzer.replaced_nodes.add (expr);
diff --git a/vala/valacodebuilder.vala b/vala/valacodebuilder.vala
index fc6c4e323..6ad69047a 100644
--- a/vala/valacodebuilder.vala
+++ b/vala/valacodebuilder.vala
@@ -231,8 +231,9 @@ public class Vala.CodeBuilder {
                add_statement (new ContinueStatement (source_reference));
        }
 
-       public string add_temp_declaration (DataType? type, Expression? initializer = null) {
+       public string add_temp_declaration (DataType? type, Expression? initializer = null, bool floating = 
false) {
                var local = new LocalVariable (type, CodeNode.get_temp_name (), initializer, 
source_reference);
+               // FIXME: use create_temp_access behavior
                var stmt = new DeclarationStatement (local, source_reference);
                insert_block.insert_before (insert_statement, stmt);
                decl_nodes.add (stmt);