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ifnode.cc Go to the documentation of this file. // $Id: ifnode.cc,v 1.4 2003/08/07 23:13:06 pnav Exp $ // ---------------------------------------------------------------------- // // C-Breeze // C Compiler Framework // // Copyright (c) 2000 University of Texas at Austin // // Samuel Z. Guyer // Daniel A. Jimenez // Calvin Lin // // Permission is hereby granted, free of charge, to any person // obtaining a copy of this software and associated documentation // files (the "Software"), to deal in the Software without // restriction, including without limitation the rights to use, copy, // modify, merge, publish, distribute, sublicense, and/or sell copies // of the Software, and to permit persons to whom the Software is // furnished to do so, subject to the following conditions: // // The above copyright notice and this permission notice shall be // included in all copies or substantial portions of the Software. // // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND // NONINFRINGEMENT. IN NO EVENT SHALL THE UNIVERSITY OF TEXAS AT // AUSTIN BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER // IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF // OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN // THE SOFTWARE. // // We acknowledge the C-to-C Translator from MIT Laboratory for // Computer Science for inspiring parts of the C-Breeze design. // // ---------------------------------------------------------------------- #include "c_breeze.h" // -------------------------------------------------------------------- // Constructors // -------------------------------------------------------------------- ifNode::ifNode(exprNode * expr, stmtNode * true_br, stmtNode * false_br, const Coord if_coord, const Coord else_coord) : selectionNode(If, expr, true_br, if_coord), _false_br(blockNode::toBlock(false_br, if_coord)), _else_coord(else_coord) {} // ------------------------------------------------------------ // Walker // ------------------------------------------------------------ void ifNode::visit(Visitor * the_visitor) { the_visitor->at_if(this); } void ifNode::walk(Walker & the_walker) { Walker::Order ord = the_walker.order(); if (ord == Walker::Preorder || ord == Walker::Both) the_walker.at_if(this, Walker::Preorder); if (the_walker.depth() == Walker::Subtree) { // -- Visit the children if (expr()) expr()->walk(the_walker); if (true_br()) true_br()->walk(the_walker); if (false_br()) false_br()->walk(the_walker); } if (ord == Walker::Postorder || ord == Walker::Both) the_walker.at_if(this, Walker::Postorder); } // ------------------------------------------------------------ // Dataflow // ------------------------------------------------------------ void ifNode::dataflow(FlowVal * v, FlowProblem & fp) { if (fp.forward()) { fp.flow_if(v, this, FlowProblem::Entry); if (expr()) if (fp.basicblocks()) { fp.flow_basicblock(v, expr(), FlowProblem::Entry); fp.flow_basicblock(v, expr(), FlowProblem::Exit); } else expr()->dataflow(v, fp); FlowVal * fv = v->clone(); if (true_br()) true_br()->dataflow(v, fp); if (false_br()) false_br()->dataflow(fv, fp); v->meet(fv); delete fv; fp.flow_if(v, this, FlowProblem::Exit); } else { fp.flow_if(v, this, FlowProblem::Exit); FlowVal * fv = v->clone(); if (true_br()) true_br()->dataflow(v, fp); if (false_br()) false_br()->dataflow(fv, fp); v->meet(fv); delete fv; if (expr()) if (fp.basicblocks()) { fp.flow_basicblock(v, expr(), FlowProblem::Exit); fp.flow_basicblock(v, expr(), FlowProblem::Entry); } else expr()->dataflow(v, fp); fp.flow_if(v, this, FlowProblem::Entry); } } // ------------------------------------------------------------ // Output // ------------------------------------------------------------ void ifNode::output_stmt(output_context & ct, Node * parent) { ct << "if " << '('; if (expr()) expr()->output(ct, this); ct << ')'; ct.space(); if (true_br()) true_br()->output(ct, this); else ct << ';'; blockNode * fb = false_br(); if (fb) { ct.new_line(); ct << "else"; ct.space(); false_br()->output(ct, this); } } // ------------------------------------------------------------ // Changer // ------------------------------------------------------------ Node * ifNode::change(Changer & the_changer, bool redispatch) { Changer::Order ord = the_changer.order(); ifNode * the_if = this; if ((ord == Changer::Preorder || ord == Changer::Both) && ! redispatch) the_if = (ifNode *) the_changer.at_if(the_if, Changer::Preorder); if (the_if) { if (the_if != this) return the_if->change(the_changer, true); exprNode * old_expr = the_if->expr(); if (old_expr) { exprNode * new_expr = (exprNode *) old_expr->change(the_changer); if (old_expr != new_expr) { //if (the_changer.delete_old()) //delete old_expr; the_if->expr(new_expr); } } blockNode * old_true_br = the_if->true_br(); if (old_true_br) { blockNode * new_true_br = (blockNode *) old_true_br->change(the_changer); if (old_true_br != new_true_br) { //if (the_changer.delete_old()) // delete old_true_br; the_if->true_br(new_true_br); } } blockNode * old_false_br = the_if->false_br(); if (old_false_br) { blockNode * new_false_br = (blockNode *) old_false_br->change(the_changer); if (old_false_br != new_false_br) { //if (the_changer.delete_old()) //delete old_false_br; the_if->false_br(new_false_br); } } } if ((ord == Changer::Postorder || ord == Changer::Both) && ! redispatch) the_if = (ifNode *) the_changer.at_if(the_if, Changer::Postorder); return the_if; } // ------------------------------------------------------------ // Destructor // ------------------------------------------------------------ ifNode::~ifNode() { //delete _false_br; }

Generated on August 27, 2003
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