source: src/SynTree/Expression.cc @ 8d7bef2

//
// 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.
//
// Expression.cc --
//
// Author           : Richard C. Bilson
// Created On       : Mon May 18 07:44:20 2015
// Last Modified By : Peter A. Buhr
// Last Modified On : Tue Jul 25 14:15:47 2017
// Update Count     : 54
//

#include "SynTree/Expression.h"

#include <cassert>                   // for assert, assertf
#include <iostream>                  // for ostream, operator<<, basic_ostream
#include <list>                      // for list, _List_iterator, list<>::co...

#include "Common/utility.h"          // for maybeClone, cloneAll, deleteAll
#include "Declaration.h"             // for ObjectDecl, DeclarationWithType
#include "Expression.h"              // for Expression, ImplicitCopyCtorExpr
#include "InitTweak/InitTweak.h"     // for getCallArg, getPointerBase
#include "Initializer.h"             // for Designation, Initializer
#include "Statement.h"               // for CompoundStmt, ExprStmt, Statement
#include "SynTree/BaseSyntaxNode.h"  // for BaseSyntaxNode
#include "SynTree/Constant.h"        // for Constant
#include "Type.h"                    // for Type, BasicType, Type::Qualifiers
#include "TypeSubstitution.h"        // for TypeSubstitution

#include "GenPoly/Lvalue.h"

void printInferParams( const InferredParams & inferParams, std::ostream &os, Indenter indent, int level ) {
        if ( ! inferParams.empty() ) {
                os << indent << "with inferred parameters " << level << ":" << std::endl;
                for ( InferredParams::const_iterator i = inferParams.begin(); i != inferParams.end(); ++i ) {
                        os << indent+1;
                        Declaration::declFromId( i->second.decl )->printShort( os, indent+1 );
                        os << std::endl;
                        printInferParams( *i->second.inferParams, os, indent+1, level+1 );
                } // for
        } // if
}

Expression::Expression() : result( 0 ), env( 0 ) {}

Expression::Expression( const Expression &other ) : BaseSyntaxNode( other ), result( maybeClone( other.result ) ), env( maybeClone( other.env ) ), extension( other.extension ), inferParams( other.inferParams ) {
}

Expression::~Expression() {
        delete env;
}

void Expression::print( std::ostream &os, Indenter indent ) const {
        printInferParams( inferParams, os, indent+1, 0 );

        if ( env ) {
                os << std::endl << indent << "... with environment:" << std::endl;
                env->print( os, indent+1 );
        } // if

        if ( extension ) {
                os << std::endl << indent << "... with extension:";
        } // if
}

ConstantExpr::ConstantExpr( Constant _c ) : Expression(), constant( _c ) {
        set_result( constant.get_type()->clone() );
}

ConstantExpr::ConstantExpr( const ConstantExpr &other) : Expression( other ), constant( other.constant ) {
}

void ConstantExpr::print( std::ostream &os, Indenter indent ) const {
        os << "constant expression " ;
        constant.print( os );
        Expression::print( os, indent );
}

long long int ConstantExpr::intValue() const {
        if ( BasicType * basicType = dynamic_cast< BasicType * >( result ) ) {
                if ( basicType->isInteger() ) {
                        return get_constant()->get_ival();
                }
        } else if ( dynamic_cast< OneType * >( result ) ) {
                return 1;
        } else if ( dynamic_cast< ZeroType * >( result ) ) {
                return 0;
        }
        SemanticError( this, "Constant expression of non-integral type " );
}

VariableExpr::VariableExpr( DeclarationWithType *_var ) : Expression(), var( _var ) {
        assert( var );
        assert( var->get_type() );
        Type * type = var->get_type()->clone();
        type->set_lvalue( true );

        // xxx - doesn't quite work yet - get different alternatives with the same cost

        // // enumerators are not lvalues
        // if ( EnumInstType * inst = dynamic_cast< EnumInstType * >( var->get_type() ) ) {
        //      assert( inst->baseEnum );
        //      EnumDecl * decl = inst->baseEnum;
        //      long long int value;
        //      if ( decl->valueOf( var, value ) ) {
        //              type->set_lvalue( false );
        //      }
        // }

        set_result( type );
}

VariableExpr::VariableExpr( const VariableExpr &other ) : Expression( other ), var( other.var ) {
}

VariableExpr * VariableExpr::functionPointer( FunctionDecl * func ) {
        VariableExpr * funcExpr = new VariableExpr( func );
        funcExpr->set_result( new PointerType( Type::Qualifiers(), funcExpr->get_result() ) );
        return funcExpr;
}

void VariableExpr::print( std::ostream &os, Indenter indent ) const {
        os << "Variable Expression: ";
        var->printShort(os, indent);
        Expression::print( os, indent );
}

SizeofExpr::SizeofExpr( Expression *expr_ ) :
                Expression(), expr(expr_), type(0), isType(false) {
        set_result( new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt ) );
}

SizeofExpr::SizeofExpr( Type *type_ ) :
                Expression(), expr(0), type(type_), isType(true) {
        set_result( new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt ) );
}

SizeofExpr::SizeofExpr( const SizeofExpr &other ) :
        Expression( other ), expr( maybeClone( other.expr ) ), type( maybeClone( other.type ) ), isType( other.isType ) {
}

void SizeofExpr::print( std::ostream &os, Indenter indent) const {
        os << "Sizeof Expression on: ";
        if (isType) type->print(os, indent+1);
        else expr->print(os, indent+1);
        Expression::print( os, indent );
}

AlignofExpr::AlignofExpr( Expression *expr_ ) :
                Expression(), expr(expr_), type(0), isType(false) {
        set_result( new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt ) );
}

AlignofExpr::AlignofExpr( Type *type_ ) :
                Expression(), expr(0), type(type_), isType(true) {
        set_result( new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt ) );
}

AlignofExpr::AlignofExpr( const AlignofExpr &other ) :
        Expression( other ), expr( maybeClone( other.expr ) ), type( maybeClone( other.type ) ), isType( other.isType ) {
}

void AlignofExpr::print( std::ostream &os, Indenter indent) const {
        os << "Alignof Expression on: ";
        if (isType) type->print(os, indent+1);
        else expr->print(os, indent+1);
        Expression::print( os, indent );
}

UntypedOffsetofExpr::UntypedOffsetofExpr( Type *type, const std::string &member ) :
                Expression(), type(type), member(member) {
        assert( type );
        set_result( new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt ) );
}

UntypedOffsetofExpr::UntypedOffsetofExpr( const UntypedOffsetofExpr &other ) :
        Expression( other ), type( maybeClone( other.type ) ), member( other.member ) {}

void UntypedOffsetofExpr::print( std::ostream &os, Indenter indent) const {
        os << "Untyped Offsetof Expression on member " << member << " of ";
        type->print(os, indent+1);
        Expression::print( os, indent );
}

OffsetofExpr::OffsetofExpr( Type *type, DeclarationWithType *member ) :
                Expression(), type(type), member(member) {
        assert( member );
        assert( type );
        set_result( new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt ) );
}

OffsetofExpr::OffsetofExpr( const OffsetofExpr &other ) :
        Expression( other ), type( maybeClone( other.type ) ), member( other.member ) {}

void OffsetofExpr::print( std::ostream &os, Indenter indent) const {
        os << "Offsetof Expression on member " << member->name << " of ";
        type->print(os, indent+1);
        Expression::print( os, indent );
}

OffsetPackExpr::OffsetPackExpr( StructInstType *type ) : Expression(), type( type ) {
        assert( type );
        set_result( new ArrayType( Type::Qualifiers(), new BasicType( Type::Qualifiers(), BasicType::LongUnsignedInt ), 0, false, false ) );
}

OffsetPackExpr::OffsetPackExpr( const OffsetPackExpr &other ) : Expression( other ), type( maybeClone( other.type ) ) {}

void OffsetPackExpr::print( std::ostream &os, Indenter indent ) const {
        os << "Offset pack expression on ";
        type->print(os, indent+1);
        Expression::print( os, indent );
}

AttrExpr::AttrExpr( Expression *attr, Expression *expr_ ) :
                Expression(), attr( attr ), expr(expr_), type(0), isType(false) {
}

AttrExpr::AttrExpr( Expression *attr, Type *type_ ) :
                Expression(), attr( attr ), expr(0), type(type_), isType(true) {
}

AttrExpr::AttrExpr( const AttrExpr &other ) :
                Expression( other ), attr( maybeClone( other.attr ) ), expr( maybeClone( other.expr ) ), type( maybeClone( other.type ) ), isType( other.isType ) {
}

void AttrExpr::print( std::ostream &os, Indenter indent) const {
        os << "Attr ";
        attr->print( os, indent+1);
        if ( isType || expr ) {
                os << "applied to: ";
                if (isType) type->print(os, indent+1);
                else expr->print(os, indent+1);
        } // if
        Expression::print( os, indent );
}

CastExpr::CastExpr( Expression *arg_, Type *toType ) : Expression(), arg(arg_) {
        set_result(toType);
}

CastExpr::CastExpr( Expression *arg_ ) : Expression(), arg(arg_) {
        set_result( new VoidType( Type::Qualifiers() ) );
}

CastExpr::CastExpr( const CastExpr &other ) : Expression( other ), arg( maybeClone( other.arg ) ) {
}

void CastExpr::print( std::ostream &os, Indenter indent ) const {
        os << "Cast of:" << std::endl << indent+1;
        arg->print(os, indent+1);
        os << std::endl << indent << "... to:";
        if ( result->isVoid() ) {
                os << " nothing";
        } else {
                os << std::endl << indent+1;
                result->print( os, indent+1 );
        } // if
        Expression::print( os, indent );
}

VirtualCastExpr::VirtualCastExpr( Expression *arg_, Type *toType ) : Expression(), arg(arg_) {
        set_result(toType);
}

VirtualCastExpr::VirtualCastExpr( const VirtualCastExpr &other ) : Expression( other ), arg( maybeClone( other.arg ) ) {
}

void VirtualCastExpr::print( std::ostream &os, Indenter indent ) const {
        os << "Virtual Cast of:" << std::endl << indent+1;
        arg->print(os, indent+1);
        os << std::endl << indent << "... to:";
        if ( ! result ) {
                os << " unknown";
        } else {
                os << std::endl << indent+1;
                result->print( os, indent+1 );
        } // if
        Expression::print( os, indent );
}

UntypedMemberExpr::UntypedMemberExpr( Expression * member, Expression *aggregate ) :
                Expression(), member(member), aggregate(aggregate) {
        assert( aggregate );
}

UntypedMemberExpr::UntypedMemberExpr( const UntypedMemberExpr &other ) :
                Expression( other ), member( maybeClone( other.member ) ), aggregate( maybeClone( other.aggregate ) ) {
}

void UntypedMemberExpr::print( std::ostream &os, Indenter indent ) const {
        os << "Untyped Member Expression, with field: " << std::endl << indent+1;
        member->print(os, indent+1 );
        os << indent << "... from aggregate: " << std::endl << indent+1;
        aggregate->print(os, indent+1);
        Expression::print( os, indent );
}

MemberExpr::MemberExpr( DeclarationWithType *member, Expression *aggregate ) :
                Expression(), member(member), aggregate(aggregate) {
        assert( member );
        assert( aggregate );
        assert( aggregate->result );

        TypeSubstitution sub = aggregate->result->genericSubstitution();
        Type * res = member->get_type()->clone();
        sub.apply( res );
        result = res;
        result->set_lvalue( true );
        result->get_qualifiers() |= aggregate->result->get_qualifiers();
}

MemberExpr::MemberExpr( const MemberExpr &other ) :
                Expression( other ), member( other.member ), aggregate( maybeClone( other.aggregate ) ) {
}

void MemberExpr::print( std::ostream &os, Indenter indent ) const {
        os << "Member Expression, with field: " << std::endl;
        os << indent+1;
        member->print( os, indent+1 );
        os << std::endl << indent << "... from aggregate: " << std::endl << indent+1;
        aggregate->print(os, indent + 1);
        Expression::print( os, indent );
}

UntypedExpr::UntypedExpr( Expression *function, const std::list<Expression *> &args ) :
                Expression(), function(function), args(args) {}

UntypedExpr::UntypedExpr( const UntypedExpr &other ) :
                Expression( other ), function( maybeClone( other.function ) ) {
        cloneAll( other.args, args );
}

UntypedExpr * UntypedExpr::createDeref( Expression * expr ) {
        UntypedExpr * ret = new UntypedExpr( new NameExpr("*?"), std::list< Expression * >{ expr } );
        if ( Type * type = expr->get_result() ) {
                Type * base = InitTweak::getPointerBase( type );
                assertf( base, "expected pointer type in dereference (type was %s)", toString( type ).c_str() );
                ret->set_result( base->clone() );
                if ( GenPoly::referencesPermissable() ) {
                        // if references are still allowed in the AST, dereference returns a reference
                        ret->set_result( new ReferenceType( Type::Qualifiers(), ret->get_result() ) );
                } else {
                        // references have been removed, in which case dereference returns an lvalue of the base type.
                        ret->result->set_lvalue( true );
                }
        }
        return ret;
}

UntypedExpr * UntypedExpr::createAssign( Expression * arg1, Expression * arg2 ) {
        assert( arg1 && arg2 );
        UntypedExpr * ret = new UntypedExpr( new NameExpr( "?=?" ), std::list< Expression * >{ arg1, arg2 } );
        if ( arg1->get_result() && arg2->get_result() ) {
                // if both expressions are typed, assumes that this assignment is a C bitwise assignment,
                // so the result is the type of the RHS
                ret->set_result( arg2->get_result()->clone() );
        }
        return ret;
}


void UntypedExpr::print( std::ostream &os, Indenter indent ) const {
        os << "Applying untyped: " << std::endl;
        os << indent+1;
        function->print(os, indent+1);
        os << std::endl << indent << "...to: " << std::endl;
        printAll(args, os, indent+1);
        Expression::print( os, indent );
}

NameExpr::NameExpr( std::string name ) : Expression(), name(name) {
        assertf(name != "0", "Zero is not a valid name");
        assertf(name != "1", "One is not a valid name");
}

NameExpr::NameExpr( const NameExpr &other ) : Expression( other ), name( other.name ) {
}

void NameExpr::print( std::ostream &os, Indenter indent ) const {
        os << "Name: " << get_name();
        Expression::print( os, indent );
}

LogicalExpr::LogicalExpr( Expression *arg1_, Expression *arg2_, bool andp ) :
                Expression(), arg1(arg1_), arg2(arg2_), isAnd(andp) {
        set_result( new BasicType( Type::Qualifiers(), BasicType::SignedInt ) );
}

LogicalExpr::LogicalExpr( const LogicalExpr &other ) :
                Expression( other ), arg1( maybeClone( other.arg1 ) ), arg2( maybeClone( other.arg2 ) ), isAnd( other.isAnd ) {
}

void LogicalExpr::print( std::ostream &os, Indenter indent )const {
        os << "Short-circuited operation (" << (isAnd ? "and" : "or") << ") on: ";
        arg1->print(os);
        os << " and ";
        arg2->print(os);
        Expression::print( os, indent );
}

ConditionalExpr::ConditionalExpr( Expression * arg1, Expression * arg2, Expression * arg3 ) :
                Expression(), arg1(arg1), arg2(arg2), arg3(arg3) {}

ConditionalExpr::ConditionalExpr( const ConditionalExpr &other ) :
                Expression( other ), arg1( maybeClone( other.arg1 ) ), arg2( maybeClone( other.arg2 ) ), arg3( maybeClone( other.arg3 ) ) {
}

void ConditionalExpr::print( std::ostream &os, Indenter indent ) const {
        os << "Conditional expression on: " << std::endl << indent+1;
        arg1->print( os, indent+1 );
        os << indent << "First alternative:" << std::endl << indent+1;
        arg2->print( os, indent+1 );
        os << indent << "Second alternative:" << std::endl << indent+1;
        arg3->print( os, indent+1 );
        Expression::print( os, indent );
}

AsmExpr::AsmExpr( const AsmExpr & other ) : Expression( other ), inout( maybeClone( other.inout ) ), constraint( maybeClone( other.constraint ) ), operand( maybeClone( other.operand ) ) {}


void AsmExpr::print( std::ostream &os, Indenter indent ) const {
        os << "Asm Expression: " << std::endl;
        if ( inout ) inout->print( os, indent+1 );
        if ( constraint ) constraint->print( os, indent+1 );
        if ( operand ) operand->print( os, indent+1 );
}


ImplicitCopyCtorExpr::ImplicitCopyCtorExpr( ApplicationExpr * callExpr ) : callExpr( callExpr ) {
        assert( callExpr );
        assert( callExpr->result );
        set_result( callExpr->get_result()->clone() );
}

ImplicitCopyCtorExpr::ImplicitCopyCtorExpr( const ImplicitCopyCtorExpr & other ) : Expression( other ), callExpr( maybeClone( other.callExpr ) ) {
        cloneAll( other.tempDecls, tempDecls );
        cloneAll( other.returnDecls, returnDecls );
        cloneAll( other.dtors, dtors );
}

ImplicitCopyCtorExpr::~ImplicitCopyCtorExpr() {
        set_env( nullptr ); // ImplicitCopyCtorExpr does not take ownership of an environment
}

void ImplicitCopyCtorExpr::print( std::ostream &os, Indenter indent ) const {
        os <<  "Implicit Copy Constructor Expression: " << std::endl << indent+1;
        callExpr->print( os, indent+1 );
        os << std::endl << indent << "... with temporaries:" << std::endl;
        printAll( tempDecls, os, indent+1 );
        os << std::endl << indent << "... with return temporaries:" << std::endl;
        printAll( returnDecls, os, indent+1 );
        Expression::print( os, indent );
}


ConstructorExpr::ConstructorExpr( Expression * callExpr ) : callExpr( callExpr ) {
        // allow resolver to type a constructor used as an expression as if it has the same type as its first argument
        assert( callExpr );
        Expression * arg = InitTweak::getCallArg( callExpr, 0 );
        assert( arg );
        set_result( maybeClone( arg->result ) );
}

ConstructorExpr::ConstructorExpr( const ConstructorExpr & other ) : Expression( other ), callExpr( maybeClone( other.callExpr ) ) {
}

void ConstructorExpr::print( std::ostream &os, Indenter indent ) const {
        os <<  "Constructor Expression: " << std::endl << indent+1;
        callExpr->print( os, indent + 2 );
        Expression::print( os, indent );
}


CompoundLiteralExpr::CompoundLiteralExpr( Type * type, Initializer * initializer ) : initializer( initializer ) {
        assert( type && initializer );
        type->set_lvalue( true );
        set_result( type );
}

CompoundLiteralExpr::CompoundLiteralExpr( const CompoundLiteralExpr &other ) : Expression( other ), initializer( other.initializer->clone() ) {}

void CompoundLiteralExpr::print( std::ostream &os, Indenter indent ) const {
        os << "Compound Literal Expression: " << std::endl << indent+1;
        result->print( os, indent+1 );
        os << indent+1;
        initializer->print( os, indent+1 );
        Expression::print( os, indent );
}

RangeExpr::RangeExpr( Expression *low, Expression *high ) : low( low ), high( high ) {}
RangeExpr::RangeExpr( const RangeExpr &other ) : Expression( other ), low( other.low->clone() ), high( other.high->clone() ) {}
void RangeExpr::print( std::ostream &os, Indenter indent ) const {
        os << "Range Expression: ";
        low->print( os, indent );
        os << " ... ";
        high->print( os, indent );
        Expression::print( os, indent );
}

StmtExpr::StmtExpr( CompoundStmt *statements ) : statements( statements ) {
        computeResult();
}
StmtExpr::StmtExpr( const StmtExpr &other ) : Expression( other ), statements( other.statements->clone() ) {
        cloneAll( other.returnDecls, returnDecls );
        cloneAll( other.dtors, dtors );
}
void StmtExpr::computeResult() {
        assert( statements );
        std::list< Statement * > & body = statements->kids;
        result = nullptr;
        if ( ! returnDecls.empty() ) {
                // prioritize return decl for result type, since if a return decl exists, then
                // the StmtExpr is currently in an intermediate state where the body will always
                // give a void result type.
                result = returnDecls.front()->get_type()->clone();
        } else if ( ! body.empty() ) {
                if ( ExprStmt * exprStmt = dynamic_cast< ExprStmt * >( body.back() ) ) {
                        result = maybeClone( exprStmt->expr->result );
                }
        }
        // ensure that StmtExpr has a result type
        if ( ! result ) {
                result = new VoidType( Type::Qualifiers() );
        }
}
void StmtExpr::print( std::ostream &os, Indenter indent ) const {
        os << "Statement Expression: " << std::endl << indent+1;
        statements->print( os, indent+1 );
        if ( ! returnDecls.empty() ) {
                os << indent+1 << "... with returnDecls: ";
                printAll( returnDecls, os, indent+1 );
        }
        if ( ! dtors.empty() ) {
                os << indent+1 << "... with dtors: ";
                printAll( dtors, os, indent+1 );
        }
        Expression::print( os, indent );
}


long long UniqueExpr::count = 0;
UniqueExpr::UniqueExpr( Expression *expr, long long idVal ) : expr( expr ), object( nullptr ), var( nullptr ), id( idVal ) {
        assert( expr );
        assert( count != -1 );
        if ( id == -1 ) id = count++;
        if ( expr->get_result() ) {
                set_result( expr->get_result()->clone() );
        }
}
UniqueExpr::UniqueExpr( const UniqueExpr &other ) : Expression( other ), expr( maybeClone( other.expr ) ), object( maybeClone( other.object ) ), var( maybeClone( other.var ) ), id( other.id ) {
}

void UniqueExpr::print( std::ostream &os, Indenter indent ) const {
        os << "Unique Expression with id:" << id << std::endl << indent+1;
        expr->print( os, indent+1 );
        if ( object ) {
                os << indent << "... with decl: ";
                get_object()->printShort( os, indent+1 );
        }
        Expression::print( os, indent );
}

InitAlternative::InitAlternative( Type * type, Designation * designation ) : type( type ), designation( designation ) {}
InitAlternative::InitAlternative( const InitAlternative & other ) : type( maybeClone( other.type ) ), designation( maybeClone( other.designation ) ) {}

UntypedInitExpr::UntypedInitExpr( Expression * expr, const std::list<InitAlternative> & initAlts ) : expr( expr ), initAlts( initAlts ) {}
UntypedInitExpr::UntypedInitExpr( const UntypedInitExpr & other ) : Expression( other ), expr( maybeClone( other.expr ) ), initAlts( other.initAlts ) {}

void UntypedInitExpr::print( std::ostream & os, Indenter indent ) const {
        os << "Untyped Init Expression" << std::endl << indent+1;
        expr->print( os, indent+1 );
        if ( ! initAlts.empty() ) {
                for ( const InitAlternative & alt : initAlts ) {
                        os << indent+1 <<  "InitAlternative: ";
                        alt.type->print( os, indent+1 );
                        alt.designation->print( os, indent+1 );
                }
        }
}

InitExpr::InitExpr( Expression * expr, Designation * designation ) : expr( expr ), designation( designation ) {
        set_result( expr->get_result()->clone() );
}
InitExpr::InitExpr( const InitExpr & other ) : Expression( other ), expr( maybeClone( other.expr ) ), designation( maybeClone( other.designation) ) {}

void InitExpr::print( std::ostream & os, Indenter indent ) const {
        os << "Init Expression" << std::endl << indent+1;
        expr->print( os, indent+1 );
        os << indent+1 << "... with designation: ";
        designation->print( os, indent+1 );
}

DeletedExpr::DeletedExpr( Expression * expr, BaseSyntaxNode * deleteStmt ) : expr( expr ), deleteStmt( deleteStmt ) {
        assert( expr->result );
        result = expr->result->clone();
}
DeletedExpr::DeletedExpr( const DeletedExpr & other ) : Expression( other ), expr( maybeClone( other.expr ) ), deleteStmt( other.deleteStmt ) {}

void DeletedExpr::print( std::ostream & os, Indenter indent ) const {
        os << "Deleted Expression" << std::endl << indent+1;
        expr->print( os, indent+1 );
        os << std::endl << indent+1 << "... deleted by: ";
        deleteStmt->print( os, indent+1 );
}


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