TPEFRelocSectionWriter.cc

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/*
    Copyright (c) 2002-2009 Tampere University.
 
    This file is part of TTA-Based Codesign Environment (TCE).
 
    Permission is hereby granted, free of charge, to any person obtaining a
    copy of this software and associated documentation files (the "Software"),
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    the rights to use, copy, modify, merge, publish, distribute, sublicense,
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    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
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/**
 * @file TPEFRelocSectionWriter.cc
 *
 * Definitions of TPEFRelocSectionWriter class.
 *
 * @author Jussi Nykänen 2003 (nykanen-no.spam-cs.tut.fi)
 * @author Mikael Lepistö 2003 (tmlepist-no.spam-cs.tut.fi)
 *
 * @note rating: yellow
 */
 
#include <list>
 
#include "TPEFRelocSectionWriter.hh"
#include "SafePointer.hh"
#include "ReferenceKey.hh"
#include "SectionSizeReplacer.hh"
#include "SectionElement.hh"
#include "SectionOffsetReplacer.hh"
#include "RelocElement.hh"
#include "SectionIdReplacer.hh"
#include "SectionIndexReplacer.hh"
#include "FileOffsetReplacer.hh"
#include "RelocSection.hh"
#include "TPEFCodeSectionWriter.hh"
#include "ImmediateElement.hh"
#include "TPEFHeaders.hh"
#include "BinaryStream.hh"
 
namespace TPEF {
 
using std::list;
using ReferenceManager::SafePointer;
using ReferenceManager::SectionKey;
using ReferenceManager::SectionOffsetKey;
using ReferenceManager::FileOffsetKey;
 
const TPEFRelocSectionWriter TPEFRelocSectionWriter::instance_;
const Word TPEFRelocSectionWriter::elementSize_ = 12;
 
/**
 * Construction.
 *
 * Registers itself to SectionWriter.
 */
TPEFRelocSectionWriter::TPEFRelocSectionWriter() : TPEFSectionWriter() {
    registerSectionWriter(this);
}
 
/**
 * Destructor.
 */
TPEFRelocSectionWriter::~TPEFRelocSectionWriter() {
}
 
/**
 * Returns the type of the section this writer can write.
 *
 * @return The type of section this writer can write.
 */
Section::SectionType
TPEFRelocSectionWriter::type() const {
    return Section::ST_RELOC;
}
 
/**
 * Writes relocation section in to stream.
 *
 * @param stream The stream where to write.
 * @param section The section to be written.
 */
void
TPEFRelocSectionWriter::actualWriteData(
    BinaryStream& stream,
    const Section* section) const {
 
    FileOffset startOffset = stream.writePosition();
 
    // file offset to data of section
    SafePointer::addObjectReference(
        FileOffsetKey(startOffset), section->element(0));
 
    const RelocSection *rSection =
        dynamic_cast<const RelocSection*>(section);
    assert(rSection != NULL);
 
 
    for (Word i = 0; i < section->elementCount(); i++) {
        RelocElement* rElem = 
            dynamic_cast<RelocElement*>(section->element(i));
        assert(rElem != NULL);
 
        // r_offset
        if (rElem->location() != NULL) {
            SectionOffsetReplacer sReplacer(rElem->location());
            sReplacer.resolve();
        } else {
            bool locationOfRelocationMustBeSet = false;
            assert(locationOfRelocationMustBeSet);
        }
        
        // r_symbol
        if (rElem->symbol() != NULL) {
            SectionIndexReplacer indexReplacer(rElem->symbol(), sizeof(Word));
            indexReplacer.resolve();
        } else {
            bool symbolFieldOfRelocationMustBeSet = false;
            assert(symbolFieldOfRelocationMustBeSet);
        }
 
        // r_type
        Byte rType = 0;
 
        // chunked bit on if necessary.
        if (rElem->chunked()) {
            rType = rType | TPEFHeaders::STF_CHUNK;
        }
 
        // and relocation type
        rType = rType | static_cast<Byte>(rElem->type());
 
        stream.writeByte(rType);
 
        // r_asp
        SectionIndexReplacer indexReplacer(rElem->aSpace(), sizeof(Byte));
        indexReplacer.resolve();
 
        // r_size bit width of the value of element referred by location
        stream.writeByte(rElem->size());
 
        // r_bitpos for chunked relocations
        stream.writeByte(rElem->bitOffset());
    }
 
    SectionSizeReplacer::setSize(section,
                                 stream.writePosition() - startOffset);
}
 
/**
 * Returns size of element.
 *
 * @param section Section that is written.
 * @return Size of element of this section.
 */
Word
TPEFRelocSectionWriter::elementSize(const Section* /*section*/) const {
    return elementSize_;
}
 
/**
 * Writes Info field of section header.
 *
 * @param stream The stream where to write.
 * @param sect Section to write.
 */
void
TPEFRelocSectionWriter::writeInfo(BinaryStream& stream,
                  const Section* sect) const {
 
    const Section* refSection =
        dynamic_cast<const RelocSection*>(sect)->referencedSection();
    
    SectionIdReplacer idReplacer(refSection);
    idReplacer.resolve();
 
    stream.writeHalfWord(0);
}
 
}