C++ MemoryMap::exists方法代码示例

/* Looks at the RVA/Size pairs in the PE header and creates an SgAsmGenericSection object for each one.  This must be done
 * after we build the mapping from virtual addresses to file offsets. */
void
SgAsmPEFileHeader::create_table_sections()
{

    /* First, only create the sections. */
    for (size_t i=0; i<p_rvasize_pairs->get_pairs().size(); i++) {
        SgAsmPERVASizePair *pair = p_rvasize_pairs->get_pairs()[i];
        if (0==pair->get_e_size())
            continue;

        /* Table names come from PE file specification and are hard coded by RVA/Size pair index */
        const char *tabname_short;
        std::string tabname = rvasize_pair_name((PairPurpose)i, &tabname_short);

        /* Find the starting offset in the file.
         * FIXME: We have a potential problem here in that ROSE sections are always contiguous in the file but a section created
         *        from an RVA/Size pair is not necessarily contiguous in the file.  Normally such sections are in fact
         *        contiguous and we'll just ignore this for now.  In any case, as long as these sections only ever read their
         *        data via the same MemoryMap that we use here, everything should be fine. [RPM 2009-08-17] */
        rose_addr_t pair_va = get_base_va() + pair->get_e_rva();
        MemoryMap *map = get_loader_map();
        ROSE_ASSERT(map!=NULL);
        if (!map->exists(Extent(pair_va, pair->get_e_size()))) {
            fprintf(stderr, "SgAsmPEFileHeader::create_table_sections: warning: pair-%zu, rva=0x%08"PRIx64", size=%"PRIu64
                    " bytes \"%s\": unable to find a mapping for the virtual address (skipping)\n",
                    i, pair->get_e_rva().get_rva(), pair->get_e_size(), tabname.c_str());
            continue;
        }
        std::pair<Extent, MemoryMap::Segment> me = map->at(pair_va);
        rose_addr_t file_offset = me.second.get_buffer_offset(me.first, pair_va);

        /* Create the new section */
        SgAsmGenericSection *tabsec = NULL;
        switch (i) {
            case 0: {
                /* Sometimes export sections are represented by a ".edata" section, and sometimes they're represented by an
                 * RVA/Size pair, and sometimes both point to the same part of the file. We don't want the exports duplicated
                 * in the AST, so we only create this table as exports if we haven't already seen some other export section. */
                SgAsmGenericSectionPtrList &sections = get_sections()->get_sections();
                bool seen_exports = false;
                for (SgAsmGenericSectionPtrList::iterator si=sections.begin(); !seen_exports && si!=sections.end(); ++si)
                    seen_exports = isSgAsmPEExportSection(*si);
                if (seen_exports) {
                    tabsec = new SgAsmGenericSection(get_file(), this);
                } else {
                    tabsec = new SgAsmPEExportSection(this);
                }
                break;
            }
            case 1: {
                /* Sometimes import sections are represented by a ".idata" section, and sometimes they're represented by an
                 * RVA/Size pair, and sometimes both point to the same part of the file.  We don't want the imports duplicated
                 * in the AST, so we only create this table as imports if we haven't already seen some other import section. */
                SgAsmGenericSectionPtrList &sections = get_sections()->get_sections();
                bool seen_imports = false;
                for (SgAsmGenericSectionPtrList::iterator si=sections.begin(); !seen_imports && si!=sections.end(); ++si)
                    seen_imports = isSgAsmPEImportSection(*si);
                if (seen_imports) {
                    tabsec = new SgAsmGenericSection(get_file(), this);
                } else {
                    tabsec = new SgAsmPEImportSection(this);
                }
                break;
            }
            default: {
                tabsec = new SgAsmGenericSection(get_file(), this);
                break;
            }
        }
        tabsec->set_name(new SgAsmBasicString(tabname));
        tabsec->set_short_name(tabname_short);
        tabsec->set_synthesized(true);
        tabsec->set_purpose(SP_HEADER);

        tabsec->set_offset(file_offset);
        tabsec->set_size(pair->get_e_size());
        tabsec->set_file_alignment(1);

        tabsec->set_mapped_alignment(1);
        tabsec->set_mapped_preferred_rva(pair->get_e_rva().get_rva());
        tabsec->set_mapped_actual_va(pair->get_e_rva().get_rva()+get_base_va()); /*FIXME: not sure this is correct. [RPM 2009-09-11]*/
        tabsec->set_mapped_size(pair->get_e_size());
        tabsec->set_mapped_rperm(true);
        tabsec->set_mapped_wperm(false);
        tabsec->set_mapped_xperm(false);
        pair->set_section(tabsec);
        pair->set_e_rva(pair->get_e_rva().set_section(tabsec));
    }

    /* Now parse the sections */
    for (size_t i=0; i<p_rvasize_pairs->get_pairs().size(); i++) {
        SgAsmPERVASizePair *pair = p_rvasize_pairs->get_pairs()[i];
        SgAsmGenericSection *tabsec = pair->get_section();
        if (tabsec)
            tabsec->parse();
    }
}