source: src/Parser/ParseNode.cc @ dae881f

//
// 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.
//
// ParseNode.cc -- 
//
// Author           : Rodolfo G. Esteves
// Created On       : Sat May 16 13:26:29 2015
// Last Modified By : Peter A. Buhr
// Last Modified On : Sun Jul 24 02:17:01 2016
// Update Count     : 90
// 

#include <climits>
#include "ParseNode.h"
using namespace std;

// Difficult to separate extra parts of constants during lexing because actions are not allow in the middle of patterns:
//
//              prefix action constant action suffix
//
// Alternatively, breaking a pattern using BEGIN does not work if the following pattern can be empty:
//
//              constant BEGIN CONT ...
//              <CONT>(...)? BEGIN 0 ... // possible empty suffix
//
// because the CONT rule is NOT triggered if the pattern is empty. Hence, constants are reparsed here to determine their
// type.

static Type::Qualifiers emptyQualifiers;                                // no qualifiers on constants

static inline bool checkU( char c ) { return c == 'u' || c == 'U'; }
static inline bool checkL( char c ) { return c == 'l' || c == 'L'; }
static inline bool checkF( char c ) { return c == 'f' || c == 'F'; }
static inline bool checkD( char c ) { return c == 'd' || c == 'D'; }
static inline bool checkI( char c ) { return c == 'i' || c == 'I'; }
static inline bool checkX( char c ) { return c == 'x' || c == 'X'; }

ConstantNode *makeConstantInteger( std::string & str ) {
        static const BasicType::Kind kind[2][3] = {
                { BasicType::SignedInt, BasicType::LongSignedInt, BasicType::LongLongSignedInt },
                { BasicType::UnsignedInt, BasicType::LongUnsignedInt, BasicType::LongLongUnsignedInt },
        };
        bool dec = true, Unsigned = false;                                      // decimal, unsigned constant
        int size;                                                                                       // 0 => int, 1 => long, 2 => long long
        unsigned long long v;                                                           // converted integral value
        size_t last = str.length() - 1;                                         // last character of constant

        if ( str[0] == '0' ) {                                                          // octal/hex constant ?
                dec = false;
                if ( last != 0 && checkX( str[1] ) ) {                  // hex constant ?
                        sscanf( (char *)str.c_str(), "%llx", &v );
                        //printf( "%llx %llu\n", v, v );
                } else {                                                                                // octal constant
                        sscanf( (char *)str.c_str(), "%llo", &v );
                        //printf( "%llo %llu\n", v, v );
                } // if
        } else {                                                                                        // decimal constant ?
                sscanf( (char *)str.c_str(), "%llu", &v );
                //printf( "%llu %llu\n", v, v );
        } // if

        if ( v <= INT_MAX ) {                                                           // signed int
                size = 0;
        } else if ( v <= UINT_MAX && ! dec ) {                          // unsigned int
                size = 0;
                Unsigned = true;                                                                // unsigned
        } else if ( v <= LONG_MAX ) {                                           // signed long int
                size = 1;
        } else if ( v <= ULONG_MAX && ( ! dec || LONG_MAX == LLONG_MAX ) ) { // signed long int
                size = 1;
                Unsigned = true;                                                                // unsigned long int
        } else if ( v <= LLONG_MAX ) {                                          // signed long long int
                size = 2;
        } else {                                                                                        // unsigned long long int
                size = 2;
                Unsigned = true;                                                                // unsigned long long int
        } // if

        if ( checkU( str[last] ) ) {                                            // suffix 'u' ?
                Unsigned = true;
                if ( last > 0 && checkL( str[last - 1] ) ) {    // suffix 'l' ?
                        size = 1;
                        if ( last > 1 && checkL( str[last - 2] ) ) { // suffix 'll' ?
                                size = 2;
                        } // if
                } // if
        } else if ( checkL( str[ last ] ) ) {                           // suffix 'l' ?
                size = 1;
                if ( last > 0 && checkL( str[last - 1] ) ) { // suffix 'll' ?
                        size = 2;
                        if ( last > 1 && checkU( str[last - 2] ) ) { // suffix 'u' ?
                                Unsigned = true;
                        } // if
                } else {
                        if ( last > 0 && checkU( str[last - 1] ) ) { // suffix 'u' ?
                                Unsigned = true;
                        } // if
                } // if
        } // if

        return new ConstantNode( new ConstantExpr( Constant( new BasicType( emptyQualifiers, kind[Unsigned][size] ), str ), nullptr ) );
} // makeConstantInteger

ConstantNode *makeConstantFloat( std::string & str ) {
        static const BasicType::Kind kind[2][3] = {
                { BasicType::Float, BasicType::Double, BasicType::LongDouble },
                { BasicType::FloatComplex, BasicType::DoubleComplex, BasicType::LongDoubleComplex },
        };

        bool complx = false;                                                            // real, complex
        int size = 1;                                                                           // 0 => float, 1 => double (default), 2 => long double
        // floating-point constant has minimum of 2 characters: 1. or .1
        size_t last = str.length() - 1;

        if ( checkI( str[last] ) ) {                                            // imaginary ?
                complx = true;
                last -= 1;                                                                              // backup one character
        } // if

        if ( checkF( str[last] ) ) {                                            // float ?
                size = 0;
        } else if ( checkD( str[last] ) ) {                                     // double ?
                size = 1;
        } else if ( checkL( str[last] ) ) {                                     // long double ?
                size = 2;
        } // if
        if ( ! complx && checkI( str[last - 1] ) ) {            // imaginary ?
                complx = true;
        } // if

        return new ConstantNode( new ConstantExpr( Constant( new BasicType( emptyQualifiers, kind[complx][size] ), str ), nullptr ) );
} // makeConstantFloat

ConstantNode *makeConstantChar( std::string & str ) {
        return new ConstantNode( new ConstantExpr( Constant( new BasicType( emptyQualifiers, BasicType::Char ), str ), nullptr ) );
} // makeConstantChar

ConstantNode *makeConstantStr( std::string & str ) {
        // string should probably be a primitive type
        ArrayType *at = new ArrayType( emptyQualifiers, new BasicType( emptyQualifiers, BasicType::Char ),
                                                                   new ConstantExpr(
                                                                           Constant( new BasicType( emptyQualifiers, BasicType::UnsignedInt ),
                                                                                                 toString( str.size()+1-2 ) ) ),  // +1 for '\0' and -2 for '"'
                                                                   false, false );
        return new ConstantNode( new ConstantExpr( Constant( at, str ), nullptr ) );
} // makeConstantStr


// Builder
int ParseNode::indent_by = 4;

ParseNode::ParseNode() : next( 0 ) {};
ParseNode::ParseNode( const string *name ) : name( *name ), next( 0 ) { delete name; }
ParseNode::ParseNode( const string &name ) : name( name ), next( 0 ) { }

ParseNode::~ParseNode() {
        delete next;
};

ParseNode *ParseNode::get_last() {
        ParseNode *current = this;

        while ( current->get_link() != 0 )
        current = current->get_link();

        return current;
}

ParseNode *ParseNode::set_link( ParseNode *next_ ) {
        if ( next_ != 0 ) get_last()->next = next_;
        return this;
}

void ParseNode::print( std::ostream &os, int indent ) const {}


void ParseNode::printList( std::ostream &os, int indent ) const {
        print( os, indent );

        if ( next ) {
                next->printList( os, indent );
        } // if
}

ParseNode &ParseNode::operator,( ParseNode &p ) {
        set_link( &p );

        return *this;
}

ParseNode *mkList( ParseNode &pn ) {
        // it just relies on `operator,' to take care of the "arguments" and provides a nice interface to an awful-looking
        // address-of, rendering, for example (StatementNode *)(&(*$5 + *$7)) into (StatementNode *)mkList(($5, $7))
        // (although "nice" is probably not the word)
        return &pn;
}

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