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[/] [lxp32/] [trunk/] [tools/] [src/] [lxp32asm/] [linkableobject.cpp] - Rev 8
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/* * Copyright (c) 2016 by Alex I. Kuznetsov. * * Part of the LXP32 CPU IP core. * * This module implements members of the LinkableObject class. */ #include "linkableobject.h" #include "utils.h" #include <iostream> #include <fstream> #include <stdexcept> #include <utility> #include <cassert> #include <cstdlib> std::string LinkableObject::name() const { return _name; } void LinkableObject::setName(const std::string &str) { _name=str; } LinkableObject::Word LinkableObject::virtualAddress() const { return _virtualAddress; } void LinkableObject::setVirtualAddress(Word addr) { _virtualAddress=addr; } LinkableObject::Byte *LinkableObject::code() { return _code.data(); } const LinkableObject::Byte *LinkableObject::code() const { return _code.data(); } std::size_t LinkableObject::codeSize() const { return _code.size(); } LinkableObject::Word LinkableObject::addWord(Word w) { auto rva=addPadding(sizeof(Word)); // Note: this code doesn't depend on host machine's endianness _code.push_back(static_cast<Byte>(w)); _code.push_back(static_cast<Byte>(w>>8)); _code.push_back(static_cast<Byte>(w>>16)); _code.push_back(static_cast<Byte>(w>>24)); return rva; } LinkableObject::Word LinkableObject::addByte(Byte b) { auto rva=static_cast<LinkableObject::Word>(_code.size()); _code.push_back(b); return rva; } LinkableObject::Word LinkableObject::addBytes(const Byte *p,std::size_t n) { auto rva=static_cast<LinkableObject::Word>(_code.size()); _code.insert(_code.end(),p,p+n); return rva; } LinkableObject::Word LinkableObject::addZeros(std::size_t n) { auto rva=static_cast<LinkableObject::Word>(_code.size()); _code.resize(_code.size()+n); return rva; } LinkableObject::Word LinkableObject::addPadding(std::size_t size) { auto padding=(size-_code.size()%size)%size; if(padding>0) _code.resize(_code.size()+padding); return static_cast<LinkableObject::Word>(_code.size()); } LinkableObject::Word LinkableObject::getWord(Word rva) const { Word w=0; if(rva<codeSize()) w|=static_cast<Word>(_code[rva++]); if(rva<codeSize()) w|=static_cast<Word>(_code[rva++])<<8; if(rva<codeSize()) w|=static_cast<Word>(_code[rva++])<<16; if(rva<codeSize()) w|=static_cast<Word>(_code[rva++])<<24; return w; } void LinkableObject::replaceWord(Word rva,Word value) { assert(rva+sizeof(Word)<=codeSize()); // Note: this code doesn't depend on host machine's endianness _code[rva++]=static_cast<Byte>(value); _code[rva++]=static_cast<Byte>(value>>8); _code[rva++]=static_cast<Byte>(value>>16); _code[rva++]=static_cast<Byte>(value>>24); } void LinkableObject::addSymbol(const std::string &name,Word rva) { auto &data=symbol(name); if(data.type!=Unknown) throw std::runtime_error("Symbol \""+name+"\" is already defined"); data.type=Local; data.rva=rva; } void LinkableObject::addImportedSymbol(const std::string &name) { auto &data=symbol(name); if(data.type!=Unknown) throw std::runtime_error("Symbol \""+name+"\" is already defined"); data.type=Imported; } void LinkableObject::exportSymbol(const std::string &name) { auto it=_symbols.find(name); if(it==_symbols.end()||it->second.type==Unknown) throw std::runtime_error("Undefined symbol \""+name+"\""); if(it->second.type==Imported) throw std::runtime_error("Symbol \""+name+"\" can't be both imported and exported at the same time"); if(it->second.type==Exported) throw std::runtime_error("Symbol \""+name+"\" has been already exported"); it->second.type=Exported; } void LinkableObject::addReference(const std::string &symbolName,const Reference &ref) { auto &data=symbol(symbolName); data.refs.push_back(ref); } LinkableObject::SymbolData &LinkableObject::symbol(const std::string &name) { return _symbols[name]; } const LinkableObject::SymbolData &LinkableObject::symbol(const std::string &name) const { auto const it=_symbols.find(name); if(it==_symbols.end()) throw std::runtime_error("Undefined symbol \""+name+"\""); return it->second; } const LinkableObject::SymbolTable &LinkableObject::symbols() const { return _symbols; } void LinkableObject::serialize(const std::string &filename) const { std::ofstream out(filename,std::ios_base::out); if(!out) throw std::runtime_error("Cannot open \""+filename+"\" for writing"); out<<"LinkableObject"<<std::endl; if(!_name.empty()) out<<"Name "<<Utils::urlEncode(_name)<<std::endl; out<<"VirtualAddress 0x"<<Utils::hex(_virtualAddress)<<std::endl; out<<std::endl; out<<"Start Code"<<std::endl; for(Word rva=0;rva<_code.size();rva+=sizeof(Word)) { out<<"\t0x"<<Utils::hex(getWord(rva))<<std::endl; } out<<"End Code"<<std::endl; for(auto const &sym: _symbols) { if(sym.second.type==Unknown) throw std::runtime_error("Undefined symbol: \""+sym.first+"\""); out<<std::endl; out<<"Start Symbol"<<std::endl; out<<"\tName "<<Utils::urlEncode(sym.first)<<std::endl; if(sym.second.type==Local) out<<"\tType Local"<<std::endl; else if(sym.second.type==Exported) out<<"\tType Exported"<<std::endl; else out<<"\tType Imported"<<std::endl; if(sym.second.type!=Imported) out<<"\tRVA 0x"<<Utils::hex(sym.second.rva)<<std::endl; for(auto const &ref: sym.second.refs) { out<<"\tRef "; out<<Utils::urlEncode(ref.source)<<" "; out<<ref.line<<" "; out<<"0x"<<Utils::hex(ref.rva)<<" "; out<<ref.offset<<" "; if(ref.type==Regular) out<<"Regular"<<std::endl; else if(ref.type==Short) out<<"Short"<<std::endl; } out<<"End Symbol"<<std::endl; } } void LinkableObject::deserialize(const std::string &filename) { std::ifstream in(filename,std::ios_base::in); if(!in) throw std::runtime_error("Cannot open \""+filename+"\""); operator=(LinkableObject()); std::string line; for(;;) { if(!std::getline(in,line)) throw std::runtime_error("Bad object format"); auto tokens=tokenize(line); if(tokens.empty()) continue; else if(tokens[0]!="LinkableObject") throw std::runtime_error("Bad object format"); break; } while(std::getline(in,line)) { auto tokens=tokenize(line); if(tokens.empty()) continue; if(tokens.size()<2) throw std::runtime_error("Unexpected end of line"); else if(tokens[0]=="Name") _name=Utils::urlDecode(tokens[1]); else if(tokens[0]=="VirtualAddress") _virtualAddress=std::strtoul(tokens[1].c_str(),NULL,0); else if(tokens[0]=="Start") { if(tokens[1]=="Code") deserializeCode(in); else if(tokens[1]=="Symbol") deserializeSymbol(in); else throw std::runtime_error("Unexpected token: \""+tokens[1]+"\""); } else throw std::runtime_error("Unexpected token: \""+tokens[0]+"\""); } } /* * Private members */ void LinkableObject::deserializeCode(std::istream &in) { std::string line; while(std::getline(in,line)) { auto tokens=tokenize(line); if(tokens.empty()) continue; if(tokens[0]=="End") { if(tokens.size()<2) throw std::runtime_error("Unexpected end of line"); if(tokens[1]=="Code") return; throw std::runtime_error("Unexpected token: \""+tokens[1]+"\""); } auto w=static_cast<Word>(std::strtoul(tokens[0].c_str(),NULL,0)); addWord(w); } throw std::runtime_error("Unexpected end of file"); } void LinkableObject::deserializeSymbol(std::istream &in) { std::string line; std::string name; SymbolData data; while(std::getline(in,line)) { auto tokens=tokenize(line); if(tokens.empty()) continue; if(tokens[0]=="End") { if(tokens.size()<2) throw std::runtime_error("Unexpected end of line"); if(tokens[1]=="Symbol") { if(name.empty()) throw std::runtime_error("Symbol name is not defined"); if(data.type==Unknown) throw std::runtime_error("Bad symbol type"); _symbols.emplace(std::move(name),std::move(data)); return; } throw std::runtime_error("Unexpected token: \""+tokens[1]+"\""); } else if(tokens[0]=="Name") { if(tokens.size()<2) throw std::runtime_error("Unexpected end of line"); name=Utils::urlDecode(tokens[1]); } else if(tokens[0]=="Type") { if(tokens.size()<2) throw std::runtime_error("Unexpected end of line"); if(tokens[1]=="Local") data.type=Local; else if(tokens[1]=="Exported") data.type=Exported; else if(tokens[1]=="Imported") data.type=Imported; else throw std::runtime_error("Bad symbol type"); } else if(tokens[0]=="RVA") { if(tokens.size()<2) throw std::runtime_error("Unexpected end of line"); data.rva=std::strtoul(tokens[1].c_str(),NULL,0); } else if(tokens[0]=="Ref") { Reference ref; if(tokens.size()<4) throw std::runtime_error("Unexpected end of line"); ref.source=Utils::urlDecode(tokens[1]); ref.line=std::strtoul(tokens[2].c_str(),NULL,0); ref.rva=std::strtoul(tokens[3].c_str(),NULL,0); ref.offset=std::strtoll(tokens[4].c_str(),NULL,0); if(tokens[5]=="Regular") ref.type=Regular; else if(tokens[5]=="Short") ref.type=Short; else throw std::runtime_error("Invalid reference type: \""+tokens[5]+"\""); data.refs.push_back(std::move(ref)); } } throw std::runtime_error("Unexpected end of file"); } std::vector<std::string> LinkableObject::tokenize(const std::string &str) { std::vector<std::string> tokens; for(std::size_t pos=0;;) { auto start=str.find_first_not_of(" \t\r\n",pos); if(start==std::string::npos) return tokens; auto end=str.find_first_of(" \t\r\n",start); if(end==std::string::npos) { tokens.push_back(str.substr(start)); return tokens; } else tokens.push_back(str.substr(start,end-start)); pos=end; } }
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