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[/] [lxp32/] [trunk/] [tools/] [src/] [lxp32asm/] [linkableobject.cpp] - Blame information for rev 9

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Line No. Rev Author Line
1 9 ring0_mipt 
/*
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 * Copyright (c) 2016 by Alex I. Kuznetsov.
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 *
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 * Part of the LXP32 CPU IP core.
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 *
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 * This module implements members of the LinkableObject class.
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 */
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#include "linkableobject.h"
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#include "utils.h"
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#include <iostream>
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#include <fstream>
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#include <stdexcept>
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#include <utility>
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#include <cassert>
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#include <cstdlib>
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std::string LinkableObject::name() const {
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        return _name;
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}
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void LinkableObject::setName(const std::string &str) {
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        _name=str;
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}
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LinkableObject::Word LinkableObject::virtualAddress() const {
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        return _virtualAddress;
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}
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void LinkableObject::setVirtualAddress(Word addr) {
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        _virtualAddress=addr;
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}
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LinkableObject::Byte *LinkableObject::code() {
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        return _code.data();
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}
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const LinkableObject::Byte *LinkableObject::code() const {
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        return _code.data();
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}
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std::size_t LinkableObject::codeSize() const {
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        return _code.size();
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}
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LinkableObject::Word LinkableObject::addWord(Word w) {
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        auto rva=addPadding(sizeof(Word));
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// Note: this code doesn't depend on host machine's endianness
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        _code.push_back(static_cast<Byte>(w));
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        _code.push_back(static_cast<Byte>(w>>8));
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        _code.push_back(static_cast<Byte>(w>>16));
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        _code.push_back(static_cast<Byte>(w>>24));
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        return rva;
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}
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LinkableObject::Word LinkableObject::addByte(Byte b) {
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        auto rva=static_cast<LinkableObject::Word>(_code.size());
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        _code.push_back(b);
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        return rva;
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}
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LinkableObject::Word LinkableObject::addBytes(const Byte *p,std::size_t n) {
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        auto rva=static_cast<LinkableObject::Word>(_code.size());
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        _code.insert(_code.end(),p,p+n);
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        return rva;
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}
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LinkableObject::Word LinkableObject::addZeros(std::size_t n) {
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        auto rva=static_cast<LinkableObject::Word>(_code.size());
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        _code.resize(_code.size()+n);
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        return rva;
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}
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LinkableObject::Word LinkableObject::addPadding(std::size_t size) {
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        auto padding=(size-_code.size()%size)%size;
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        if(padding>0) _code.resize(_code.size()+padding);
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        return static_cast<LinkableObject::Word>(_code.size());
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}
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LinkableObject::Word LinkableObject::getWord(Word rva) const {
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        Word w=0;
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        if(rva<codeSize()) w|=static_cast<Word>(_code[rva++]);
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        if(rva<codeSize()) w|=static_cast<Word>(_code[rva++])<<8;
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        if(rva<codeSize()) w|=static_cast<Word>(_code[rva++])<<16;
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        if(rva<codeSize()) w|=static_cast<Word>(_code[rva++])<<24;
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        return w;
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}
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void LinkableObject::replaceWord(Word rva,Word value) {
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        assert(rva+sizeof(Word)<=codeSize());
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// Note: this code doesn't depend on host machine's endianness
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        _code[rva++]=static_cast<Byte>(value);
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        _code[rva++]=static_cast<Byte>(value>>8);
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        _code[rva++]=static_cast<Byte>(value>>16);
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        _code[rva++]=static_cast<Byte>(value>>24);
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}
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void LinkableObject::addSymbol(const std::string &name,Word rva) {
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        auto &data=symbol(name);
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        if(data.type!=Unknown) throw std::runtime_error("Symbol \""+name+"\" is already defined");
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        data.type=Local;
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        data.rva=rva;
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}
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void LinkableObject::addImportedSymbol(const std::string &name) {
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        auto &data=symbol(name);
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        if(data.type!=Unknown) throw std::runtime_error("Symbol \""+name+"\" is already defined");
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        data.type=Imported;
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}
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void LinkableObject::exportSymbol(const std::string &name) {
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        auto it=_symbols.find(name);
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        if(it==_symbols.end()||it->second.type==Unknown) throw std::runtime_error("Undefined symbol \""+name+"\"");
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        if(it->second.type==Imported) throw std::runtime_error("Symbol \""+name+"\" can't be both imported and exported at the same time");
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        if(it->second.type==Exported) throw std::runtime_error("Symbol \""+name+"\" has been already exported");
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        it->second.type=Exported;
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}
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void LinkableObject::addReference(const std::string &symbolName,const Reference &ref) {
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        auto &data=symbol(symbolName);
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        data.refs.push_back(ref);
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}
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LinkableObject::SymbolData &LinkableObject::symbol(const std::string &name) {
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        return _symbols[name];
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}
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const LinkableObject::SymbolData &LinkableObject::symbol(const std::string &name) const {
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        auto const it=_symbols.find(name);
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        if(it==_symbols.end()) throw std::runtime_error("Undefined symbol \""+name+"\"");
132 
        return it->second;
133 
}
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const LinkableObject::SymbolTable &LinkableObject::symbols() const {
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        return _symbols;
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}
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void LinkableObject::serialize(const std::string &filename) const {
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        std::ofstream out(filename,std::ios_base::out);
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        if(!out) throw std::runtime_error("Cannot open \""+filename+"\" for writing");
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        out<<"LinkableObject"<<std::endl;
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        if(!_name.empty()) out<<"Name "<<Utils::urlEncode(_name)<<std::endl;
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        out<<"VirtualAddress 0x"<<Utils::hex(_virtualAddress)<<std::endl;
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        out<<std::endl;
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        out<<"Start Code"<<std::endl;
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        for(Word rva=0;rva<_code.size();rva+=sizeof(Word)) {
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                out<<"\t0x"<<Utils::hex(getWord(rva))<<std::endl;
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        }
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        out<<"End Code"<<std::endl;
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        for(auto const &sym: _symbols) {
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                if(sym.second.type==Unknown)
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                        throw std::runtime_error("Undefined symbol: \""+sym.first+"\"");
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                out<<std::endl;
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                out<<"Start Symbol"<<std::endl;
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                out<<"\tName "<<Utils::urlEncode(sym.first)<<std::endl;
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                if(sym.second.type==Local) out<<"\tType Local"<<std::endl;
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                else if(sym.second.type==Exported) out<<"\tType Exported"<<std::endl;
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                else out<<"\tType Imported"<<std::endl;
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                if(sym.second.type!=Imported) out<<"\tRVA 0x"<<Utils::hex(sym.second.rva)<<std::endl;
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                for(auto const &ref: sym.second.refs) {
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                        out<<"\tRef ";
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                        out<<Utils::urlEncode(ref.source)<<" ";
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                        out<<ref.line<<" ";
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                        out<<"0x"<<Utils::hex(ref.rva)<<" ";
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                        out<<ref.offset<<" ";
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                        if(ref.type==Regular) out<<"Regular"<<std::endl;
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                        else if(ref.type==Short) out<<"Short"<<std::endl;
174 
                }
175 
                out<<"End Symbol"<<std::endl;
176 
        }
177 
}
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179 
void LinkableObject::deserialize(const std::string &filename) {
180 
        std::ifstream in(filename,std::ios_base::in);
181 
        if(!in) throw std::runtime_error("Cannot open \""+filename+"\"");
182 
 
183 
        operator=(LinkableObject());
184 
 
185 
        std::string line;
186 
        for(;;) {
187 
                if(!std::getline(in,line)) throw std::runtime_error("Bad object format");
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                auto tokens=tokenize(line);
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                if(tokens.empty()) continue;
190 
                else if(tokens[0]!="LinkableObject") throw std::runtime_error("Bad object format");
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                break;
192 
        }
193 
 
194 
        while(std::getline(in,line)) {
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                auto tokens=tokenize(line);
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                if(tokens.empty()) continue;
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                if(tokens.size()<2) throw std::runtime_error("Unexpected end of line");
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                else if(tokens[0]=="Name") _name=Utils::urlDecode(tokens[1]);
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                else if(tokens[0]=="VirtualAddress") _virtualAddress=std::strtoul(tokens[1].c_str(),NULL,0);
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                else if(tokens[0]=="Start") {
201 
                        if(tokens[1]=="Code") deserializeCode(in);
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                        else if(tokens[1]=="Symbol") deserializeSymbol(in);
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                        else throw std::runtime_error("Unexpected token: \""+tokens[1]+"\"");
204 
                }
205 
                else throw std::runtime_error("Unexpected token: \""+tokens[0]+"\"");
206 
        }
207 
}
208 
 
209 
/*
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 * Private members
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 */
212 
 
213 
void LinkableObject::deserializeCode(std::istream &in) {
214 
        std::string line;
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        while(std::getline(in,line)) {
216 
                auto tokens=tokenize(line);
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                if(tokens.empty()) continue;
218 
                if(tokens[0]=="End") {
219 
                        if(tokens.size()<2) throw std::runtime_error("Unexpected end of line");
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                        if(tokens[1]=="Code") return;
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                        throw std::runtime_error("Unexpected token: \""+tokens[1]+"\"");
222 
                }
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                auto w=static_cast<Word>(std::strtoul(tokens[0].c_str(),NULL,0));
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                addWord(w);
225 
        }
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        throw std::runtime_error("Unexpected end of file");
227 
}
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229 
void LinkableObject::deserializeSymbol(std::istream &in) {
230 
        std::string line;
231 
        std::string name;
232 
        SymbolData data;
233 
        while(std::getline(in,line)) {
234 
                auto tokens=tokenize(line);
235 
                if(tokens.empty()) continue;
236 
                if(tokens[0]=="End") {
237 
                        if(tokens.size()<2) throw std::runtime_error("Unexpected end of line");
238 
                        if(tokens[1]=="Symbol") {
239 
                                if(name.empty()) throw std::runtime_error("Symbol name is not defined");
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                                if(data.type==Unknown) throw std::runtime_error("Bad symbol type");
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                                _symbols.emplace(std::move(name),std::move(data));
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                                return;
243 
                        }
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                        throw std::runtime_error("Unexpected token: \""+tokens[1]+"\"");
245 
                }
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                else if(tokens[0]=="Name") {
247 
                        if(tokens.size()<2) throw std::runtime_error("Unexpected end of line");
248 
                        name=Utils::urlDecode(tokens[1]);
249 
                }
250 
                else if(tokens[0]=="Type") {
251 
                        if(tokens.size()<2) throw std::runtime_error("Unexpected end of line");
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                        if(tokens[1]=="Local") data.type=Local;
253 
                        else if(tokens[1]=="Exported") data.type=Exported;
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                        else if(tokens[1]=="Imported") data.type=Imported;
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                        else throw std::runtime_error("Bad symbol type");
256 
                }
257 
                else if(tokens[0]=="RVA") {
258 
                        if(tokens.size()<2) throw std::runtime_error("Unexpected end of line");
259 
                        data.rva=std::strtoul(tokens[1].c_str(),NULL,0);
260 
                }
261 
                else if(tokens[0]=="Ref") {
262 
                        Reference ref;
263 
                        if(tokens.size()<4) throw std::runtime_error("Unexpected end of line");
264 
                        ref.source=Utils::urlDecode(tokens[1]);
265 
                        ref.line=std::strtoul(tokens[2].c_str(),NULL,0);
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                        ref.rva=std::strtoul(tokens[3].c_str(),NULL,0);
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                        ref.offset=std::strtoll(tokens[4].c_str(),NULL,0);
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                        if(tokens[5]=="Regular") ref.type=Regular;
269 
                        else if(tokens[5]=="Short") ref.type=Short;
270 
                        else throw std::runtime_error("Invalid reference type: \""+tokens[5]+"\"");
271 
                        data.refs.push_back(std::move(ref));
272 
                }
273 
        }
274 
        throw std::runtime_error("Unexpected end of file");
275 
}
276 
 
277 
std::vector<std::string> LinkableObject::tokenize(const std::string &str) {
278 
        std::vector<std::string> tokens;
279 
        for(std::size_t pos=0;;) {
280 
                auto start=str.find_first_not_of(" \t\r\n",pos);
281 
                if(start==std::string::npos) return tokens;
282 
                auto end=str.find_first_of(" \t\r\n",start);
283 
                if(end==std::string::npos) {
284 
                        tokens.push_back(str.substr(start));
285 
                        return tokens;
286 
                }
287 
                else tokens.push_back(str.substr(start,end-start));
288 
                pos=end;
289 
        }
290 
}

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