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[/] [forwardcom/] [bintools/] [converters.h] - Blame information for rev 116

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1 68 Agner
/****************************  converters.h   ********************************
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* Author:        Agner Fog
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* Date created:  2017-04-17
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* Last modified: 2018-03-30
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* Version:       1.10
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* Project:       Binary tools for ForwardCom instruction set
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* Module:        converters.h
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* Description:
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* Header file for file conversion classes.
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*
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* Copyright 2006-2020 GNU General Public License http://www.gnu.org/licenses
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*****************************************************************************/
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/*******************************   Classes   ********************************
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This header file declares various classes for interpreting and converting
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different types of object files. These classes are all derived from the
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container class CFileBuffer, declared in containers.h.
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See containers.h for an explanation of the container classes and the
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operators >> and << which can transfer a data buffer from an object of one
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class to an object of another class.
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*****************************************************************************/
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#pragma once
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// Buffer for symbol names during assembly, linking, and library operations
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// symbolNameBuffer is made global in order to make it accessible to bool operator < (ElfFWC_Sym2 const &, ElfFWC_Sym2 const &)
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// It is defined in assem1.cpp
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extern CTextFileBuffer symbolNameBuffer;      // Buffer for symbol names 
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// Structure for string index entry in library
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struct SSymbolEntry {
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    uint32_t name;                        // name as offset into symbolNameBuffer
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    uint32_t library;                     // library index (1-based) or 0 if object file
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    uint32_t member;                      // module or library member offset
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    uint32_t sectioni;                    // section index within module
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    uint32_t symindex;                    // index into symbol table
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    uint16_t st_other;                    // attributes: STV_SECT_ATTR
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    uint8_t  st_type;                     // symbol type
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    uint8_t  st_bind;                     // symbol binding
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    uint8_t  status;                      // 1: has no value yet. 2: has been matched. 4: unresolved
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};
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// operator for sorting string entries
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inline bool operator < (SSymbolEntry const & a, SSymbolEntry const & b) {
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    int compare = strcmp(symbolNameBuffer.getString(a.name), symbolNameBuffer.getString(b.name));
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    if (compare) return compare < 0;             // compare names
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    if ((a.st_bind | b.st_bind) & STB_IGNORE) return false;    // ignore binding
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    return (a.st_bind & STB_WEAK) < (b.st_bind & STB_WEAK);    // strong before weak
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}
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// operator for comparing string entries. Compares name only
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inline bool operator == (SSymbolEntry const & a, SSymbolEntry const & b) {
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    return strcmp(symbolNameBuffer.getString(a.name), symbolNameBuffer.getString(b.name)) == 0;
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}
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// Class CConverter contains the input file. 
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// It redirects the task specified on the command line to some other converter class
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class CConverter : public CFileBuffer {
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public:
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    CConverter();                       // Constructor
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    void go();                          // Main action
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protected:
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    void readInputFile();               // read input file
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    void dumpELF();                     // Dump x86 ELF file
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    void disassemble();                 // Disassemble ForwardCom ELF file
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    void assemble();                    // Assemble ForwardCom assembly file
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    void link();                        // Link object files into executable file
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    void emulate();                     // emulate and run executable file
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    void lib();                         // Build or modify function libraries
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};
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// Class for interpreting and dumping ELF files
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class CELF : public CFileBuffer {
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public:
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    CELF();                                       // Default constructor
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    void parseFile();                             // Parse file buffer
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    void dump(int options);                       // Dump file
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    void makeLinkMap(FILE * stream);              // Write a link map
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    void listSymbols(CMemoryBuffer * strings, CDynamicArray<SSymbolEntry> * index, uint32_t m, uint32_t l, int scope); // Make list of public and external symbols
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    ElfFwcSym * getSymbol(uint32_t symindex);     // Get a symbol record
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    int  split();                                 // Split ELF file into containers
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    int  join(ElfFwcEhdr * header);               // Join containers into ELF file
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    void reset();                                 // Reset everything
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    uint32_t addSection(ElfFwcShdr & section, CMemoryBuffer const & strings, CMemoryBuffer const & data); // Add section header and section data
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    void extendSection(ElfFwcShdr & section, CMemoryBuffer const & data);                 // Extend previously added section
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    void insertFiller(uint64_t numBytes);         // Insert alignment fillers between sections
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    void addModuleNames(CDynamicArray<uint32_t>& moduleNames, CDynamicArray<uint32_t>& libraryNames);
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    void updateModuleNames(CDynamicArray<ElfFwcShdr> &newSectionHeaders, CMemoryBuffer &newShStrtab); // Put module names and library names into section string table for relinkable sections
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    // Add module name and library name to relinkable sections
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    void addProgHeader(ElfFwcPhdr & header);      // Add program header
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    uint32_t addSymbol(ElfFwcSym & symbol, CMemoryBuffer const & strings);               // Add a symbol
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    void addRelocation(ElfFwcReloc & relocation); // Add a relocation
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    void removePrivateSymbols(int debugOptions);  // remove local symbols and adjust relocation records with new symbol indexes
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    CDynamicArray<ElfFwcShdr> const & getSectionHeaders() const { return sectionHeaders; }  // get sectionHeaders for copying. Used by disassembly listing
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    CDynamicArray<ElfFwcSym> const & getSymbols() const { return symbols; }                // get symbols buffer for copying
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    CDynamicArray<ElfFwcReloc> const & getRelocations() const { return relocations; }      // get relocations buffer for copying
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    CMemoryBuffer const & getStringBuffer() const { return stringBuffer; }                  // get string buffer for copying
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    CMemoryBuffer const & getDataBuffer() const { return dataBuffer; }                      // get data buffer for copying
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    CFileBuffer & makeHexBuffer();                // make hexadecimal code file
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    CDynamicArray<ElfFwcSym> symbols;             // List of symbols
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    uint32_t moduleName;                          // Name of file or module as index into cmd.fileNameBuffer
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    uint32_t library;                             // Library index if this module is extracted from a library
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    bool relinkable;                              // module can be replaced by relinking
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    const char * symbolName(uint32_t index);      // Get name of symbol
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protected:
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    char * secStringTable;                        // Section header string table
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    uint32_t secStringTableLen;                   // Length of section header string table
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    uint32_t nSections;                           // Number of sections
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    int sectionHeaderSize;                        // Size of each section header
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    uint32_t symbolTableOffset;                   // Offset to symbol table
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    uint32_t symbolTableEntrySize;                // Entry size of symbol table
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    uint32_t symbolTableEntries;                  // Number of symbols
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    uint32_t symbolStringTableOffset;             // Offset to symbol string table
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    uint32_t symbolStringTableSize;               // Size of symbol string table
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    ElfFwcEhdr fileHeader;                        // Copy of file header
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    CDynamicArray<ElfFwcShdr> sectionHeaders;     // Copy of section headers
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    CDynamicArray<ElfFwcPhdr> programHeaders;     // Copy of program headers   
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    CDynamicArray<ElfFwcReloc> relocations;       // List of relocations
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    CMemoryBuffer stringBuffer;                   // String buffer with names of symbols and sections
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    CMemoryBuffer dataBuffer;                     // Raw data for sections
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    CDynamicArray<uint32_t> moduleNames;          // module names as index into cmd.fileNameBuffer. used by join function
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    CDynamicArray<uint32_t> libraryNames;         // library names as index into cmd.stringBuffer. used by join function
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    friend class CLinker;                         // Give linker access to internal buffers
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    friend void operator >> (CELF & a, CELF & b); // Transfer ownership of buffer
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    friend void operator << (CELF & a, CELF & b); // Transfer ownership of buffer
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};
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// transfer ownership of data buffer and properties except what can be generated by the split function
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inline void operator >> (CELF & a, CELF & b) {
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    static_cast<CFileBuffer&>(a) >> static_cast<CFileBuffer&>(b);
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    b.moduleName = a.moduleName;
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    b.library = a.library;
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    b.relinkable = a.relinkable;
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}
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inline void operator << (CELF & b, CELF & a) {
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    a >> b;
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}

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