source: src/Parser/StatementNode.cc @ 62a05d1

//
// Cforall Version 1.0.0 Copyright (C) 2015 University of Waterloo
//
// The contents of this file are covered under the licence agreement in the
// file "LICENCE" distributed with Cforall.
//
// StatementNode.cc --
//
// Author           : Rodolfo G. Esteves
// Created On       : Sat May 16 14:59:41 2015
// Last Modified By : Peter A. Buhr
// Last Modified On : Thu Aug 17 16:01:31 2017
// Update Count     : 345
//

#include <cassert>                 // for assert, safe_dynamic_cast, assertf
#include <list>                    // for list
#include <memory>                  // for unique_ptr
#include <string>                  // for string

#include "Common/SemanticError.h"  // for SemanticError
#include "Common/utility.h"        // for maybeMoveBuild, maybeBuild
#include "ParseNode.h"             // for StatementNode, ExpressionNode, bui...
#include "SynTree/Expression.h"    // for Expression, ConstantExpr
#include "SynTree/Label.h"         // for Label, noLabels
#include "SynTree/Declaration.h"
#include "SynTree/Statement.h"     // for Statement, BranchStmt, CaseStmt
#include "parserutility.h"         // for notZeroExpr

class Declaration;

using namespace std;


StatementNode::StatementNode( DeclarationNode *decl ) {
        assert( decl );
        DeclarationNode *agg = decl->extractAggregate();
        if ( agg ) {
                StatementNode *nextStmt = new StatementNode( new DeclStmt( noLabels, maybeBuild< Declaration >( decl ) ) );
                set_next( nextStmt );
                if ( decl->get_next() ) {
                        get_next()->set_next( new StatementNode( dynamic_cast< DeclarationNode * >(decl->get_next()) ) );
                        decl->set_next( 0 );
                } // if
        } else {
                if ( decl->get_next() ) {
                        set_next( new StatementNode( dynamic_cast< DeclarationNode * >( decl->get_next() ) ) );
                        decl->set_next( 0 );
                } // if
                agg = decl;
        } // if
        stmt.reset( new DeclStmt( noLabels, maybeMoveBuild< Declaration >(agg) ) );
} // StatementNode::StatementNode

StatementNode *StatementNode::append_last_case( StatementNode *stmt ) {
        StatementNode *prev = this;
        // find end of list and maintain previous pointer
        for ( StatementNode * curr = prev; curr != nullptr; curr = (StatementNode *)curr->get_next() ) {
                StatementNode *node = safe_dynamic_cast< StatementNode * >(curr);
                assert( dynamic_cast< CaseStmt * >(node->stmt.get()) );
                prev = curr;
        } // for
        // convert from StatementNode list to Statement list
        StatementNode *node = dynamic_cast< StatementNode * >(prev);
        std::list< Statement * > stmts;
        buildMoveList( stmt, stmts );
        // splice any new Statements to end of current Statements
        CaseStmt * caseStmt = dynamic_cast< CaseStmt * >(node->stmt.get());
        caseStmt->get_statements().splice( caseStmt->get_statements().end(), stmts );
        return this;
}

Statement *build_expr( ExpressionNode *ctl ) {
        Expression *e = maybeMoveBuild< Expression >( ctl );

        if ( e )
                return new ExprStmt( noLabels, e );
        else
                return new NullStmt( noLabels );
}

Statement *build_if( IfCtl * ctl, StatementNode *then_stmt, StatementNode *else_stmt ) {
        Statement *thenb, *elseb = 0;
        std::list< Statement * > branches;
        buildMoveList< Statement, StatementNode >( then_stmt, branches );
        assert( branches.size() == 1 );
        thenb = branches.front();

        if ( else_stmt ) {
                std::list< Statement * > branches;
                buildMoveList< Statement, StatementNode >( else_stmt, branches );
                assert( branches.size() == 1 );
                elseb = branches.front();
        } // if
        
        std::list< Statement * > init;
        if ( ctl->init != 0 ) {
                buildMoveList( ctl->init, init );
        } // if

        Expression * cond = ctl->condition ? maybeMoveBuild< Expression >(ctl->condition) : new VariableExpr( dynamic_cast<DeclarationWithType *>( dynamic_cast<DeclStmt *>( init.back() )->decl ) );
        delete ctl;
        return new IfStmt( noLabels, notZeroExpr( cond ), thenb, elseb, init );
}

Statement *build_switch( ExpressionNode *ctl, StatementNode *stmt ) {
        std::list< Statement * > branches;
        buildMoveList< Statement, StatementNode >( stmt, branches );
        // branches.size() == 0 for switch (...) {}, i.e., no declaration or statements
        return new SwitchStmt( noLabels, maybeMoveBuild< Expression >(ctl), branches );
}
Statement *build_case( ExpressionNode *ctl ) {
        std::list< Statement * > branches;
        return new CaseStmt( noLabels, maybeMoveBuild< Expression >(ctl), branches );
}
Statement *build_default() {
        std::list< Statement * > branches;
        return new CaseStmt( noLabels, nullptr, branches, true );
}

Statement *build_while( ExpressionNode *ctl, StatementNode *stmt, bool kind ) {
        std::list< Statement * > branches;
        buildMoveList< Statement, StatementNode >( stmt, branches );
        assert( branches.size() == 1 );
        return new WhileStmt( noLabels, notZeroExpr( maybeMoveBuild< Expression >(ctl) ), branches.front(), kind );
}

Statement *build_for( ForCtl *forctl, StatementNode *stmt ) {
        std::list< Statement * > branches;
        buildMoveList< Statement, StatementNode >( stmt, branches );
        assert( branches.size() == 1 );

        std::list< Statement * > init;
        if ( forctl->init != 0 ) {
                buildMoveList( forctl->init, init );
        } // if

        Expression *cond = 0;
        if ( forctl->condition != 0 )
                cond = notZeroExpr( maybeMoveBuild< Expression >(forctl->condition) );

        Expression *incr = 0;
        if ( forctl->change != 0 )
                incr = maybeMoveBuild< Expression >(forctl->change);

        delete forctl;
        return new ForStmt( noLabels, init, cond, incr, branches.front() );
}

Statement *build_branch( BranchStmt::Type kind ) {
        Statement * ret = new BranchStmt( noLabels, "", kind );
        return ret;
}
Statement *build_branch( std::string *identifier, BranchStmt::Type kind ) {
        Statement * ret = new BranchStmt( noLabels, *identifier, kind );
        delete identifier;                                                                      // allocated by lexer
        return ret;
}
Statement *build_computedgoto( ExpressionNode *ctl ) {
        return new BranchStmt( noLabels, maybeMoveBuild< Expression >(ctl), BranchStmt::Goto );
}

Statement *build_return( ExpressionNode *ctl ) {
        std::list< Expression * > exps;
        buildMoveList( ctl, exps );
        return new ReturnStmt( noLabels, exps.size() > 0 ? exps.back() : nullptr );
}

Statement *build_throw( ExpressionNode *ctl ) {
        std::list< Expression * > exps;
        buildMoveList( ctl, exps );
        assertf( exps.size() < 2, "This means we are leaking memory");
        return new ThrowStmt( noLabels, ThrowStmt::Terminate, !exps.empty() ? exps.back() : nullptr );
}

Statement *build_resume( ExpressionNode *ctl ) {
        std::list< Expression * > exps;
        buildMoveList( ctl, exps );
        assertf( exps.size() < 2, "This means we are leaking memory");
        return new ThrowStmt( noLabels, ThrowStmt::Resume, !exps.empty() ? exps.back() : nullptr );
}

Statement *build_resume_at( ExpressionNode *ctl, ExpressionNode *target ) {
        (void)ctl;
        (void)target;
        assertf( false, "resume at (non-local throw) is not yet supported," );
}

Statement *build_try( StatementNode *try_stmt, StatementNode *catch_stmt, StatementNode *finally_stmt ) {
        std::list< CatchStmt * > branches;
        buildMoveList< CatchStmt, StatementNode >( catch_stmt, branches );
        CompoundStmt *tryBlock = safe_dynamic_cast< CompoundStmt * >(maybeMoveBuild< Statement >(try_stmt));
        FinallyStmt *finallyBlock = dynamic_cast< FinallyStmt * >(maybeMoveBuild< Statement >(finally_stmt) );
        return new TryStmt( noLabels, tryBlock, branches, finallyBlock );
}
Statement *build_catch( CatchStmt::Kind kind, DeclarationNode *decl, ExpressionNode *cond, StatementNode *body ) {
        std::list< Statement * > branches;
        buildMoveList< Statement, StatementNode >( body, branches );
        assert( branches.size() == 1 );
        return new CatchStmt( noLabels, kind, maybeMoveBuild< Declaration >(decl), maybeMoveBuild< Expression >(cond), branches.front() );
}
Statement *build_finally( StatementNode *stmt ) {
        std::list< Statement * > branches;
        buildMoveList< Statement, StatementNode >( stmt, branches );
        assert( branches.size() == 1 );
        return new FinallyStmt( noLabels, dynamic_cast< CompoundStmt * >( branches.front() ) );
}

Statement *build_compound( StatementNode *first ) {
        CompoundStmt *cs = new CompoundStmt( noLabels );
        buildMoveList( first, cs->get_kids() );
        return cs;
}

Statement *build_asmstmt( bool voltile, ConstantExpr *instruction, ExpressionNode *output, ExpressionNode *input, ExpressionNode *clobber, LabelNode *gotolabels ) {
        std::list< Expression * > out, in;
        std::list< ConstantExpr * > clob;

        buildMoveList( output, out );
        buildMoveList( input, in );
        buildMoveList( clobber, clob );
        return new AsmStmt( noLabels, voltile, instruction, out, in, clob, gotolabels ? gotolabels->labels : noLabels );
}

// Local Variables: //
// tab-width: 4 //
// mode: c++ //
// compile-command: "make install" //
// End: //