ConstantConditionEliminator::ConstantConditionEliminator():
- scope_level(0),
record_only(false)
{ }
+void ConstantConditionEliminator::apply(Stage &stage)
+{
+ visit(stage.content);
+ NodeRemover().apply(stage, nodes_to_remove);
+}
+
void ConstantConditionEliminator::visit(Block &block)
{
- SetForScope<unsigned> set(scope_level, scope_level+1);
- BlockModifier::visit(block);
+ SetForScope<Block *> set_block(current_block, &block);
+ for(NodeList<Statement>::iterator i=block.body.begin(); i!=block.body.end(); ++i)
+ {
+ insert_point = i;
+ (*i)->visit(*this);
+ }
for(map<string, VariableDeclaration *>::const_iterator i=block.variables.begin(); i!=block.variables.end(); ++i)
variable_values.erase(i->second);
void ConstantConditionEliminator::visit(VariableDeclaration &var)
{
- if(var.constant || scope_level>1)
+ if(var.constant || current_block->parent)
variable_values[&var] = var.init_expression.get();
}
cond.condition->visit(eval);
if(eval.is_result_valid())
{
- flatten_block(eval.get_result() ? cond.body : cond.else_body);
+ Block &block = (eval.get_result() ? cond.body : cond.else_body);
+ current_block->body.splice(insert_point, block.body);
+ nodes_to_remove.insert(&cond);
return;
}
}
iter.condition->visit(eval);
if(eval.is_result_valid() && !eval.get_result())
{
- remove_node = true;
+ nodes_to_remove.insert(&iter);
return;
}
}
aggregate(0),
assignment(0),
assignment_target(false),
- assign_to_subscript(false),
- global_scope(true)
+ assign_to_subscript(false)
{ }
bool UnusedVariableRemover::apply(Stage &stage)
{
variables.push_back(BlockVariableMap());
- {
- SetForScope<bool> set(global_scope, false);
- for(NodeArray<VariableDeclaration>::iterator i=func.parameters.begin(); i!=func.parameters.end(); ++i)
- (*i)->visit(*this);
- func.body.visit(*this);
- }
+ for(NodeArray<VariableDeclaration>::iterator i=func.parameters.begin(); i!=func.parameters.end(); ++i)
+ (*i)->visit(*this);
+ func.body.visit(*this);
BlockVariableMap &block_variables = variables.back();
for(BlockVariableMap::iterator i=block_variables.begin(); i!=block_variables.end(); ++i)