import-trace: import debug info
If the --debug option is set, the line number table of the elf binary will be imported into the database. The information will be stored in the "dbg_mapping" table. If the --sources option is set, the source files will be imported into the database. Only the files that were actually used in the elf binary will be imported. Change-Id: I0e9de6b456bc42b329c1700c25e5839d9552cdbb
This commit is contained in:
Richard Hellwig
258
src/core/util/DwarfReader.cc
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258
src/core/util/DwarfReader.cc
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#include <fstream>
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#include <fcntl.h>
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#include <unistd.h>
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#include "DwarfReader.hpp"
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#include "libdwarf.h"
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#include "libelf.h"
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#include "Logger.hpp"
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/**
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* This source code is based on bcov 0.2.
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* Sourcefile: src/coverage.cpp
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* http://bcov.sourceforge.net/
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* GNU GENERAL PUBLIC LICENSE
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*/
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using namespace fail;
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using namespace std;
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static Logger LOG("DwarfReader");
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static void dwarfErrorHandler(Dwarf_Error error, Dwarf_Ptr /*userData*/)
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{
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char* msg=dwarf_errmsg(error);
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cerr << "dwarf error: " << msg << endl;
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}
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static string normalize(const string& filePath)
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{
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// A quick scan first...
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bool hadSep=false,needsFix=false;
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string::size_type len=filePath.length();
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if (!needsFix)
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for (string::size_type index=0;index<len;index++) {
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char c=filePath[index];
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if (c=='/') {
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if (hadSep) {
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needsFix=true;
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}
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hadSep=true;
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} else {
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if (c=='.') {
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if (hadSep||(index==0)) {
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needsFix=true;
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}
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}
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hadSep=false;
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}
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}
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if (!needsFix) {
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return filePath;
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}
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hadSep=false;
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// Construct the fixed result
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string result;
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for (string::size_type index=0;index<len;index++) {
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char c=filePath[index];
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if (c=='/') {
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if (hadSep) {
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} else result+=c;
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hadSep=true;
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} else {
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if ((c=='.')&&(hadSep||(index==0))) {
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if (index+1>=len) {
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if (hadSep)
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result.resize(result.length()-1);
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} else {
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result+=c;
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}
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continue;
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}
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char n=filePath[index+1];
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if (n=='/') {
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index++; continue;
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}
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if (n=='.') {
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if (index+2>=len) {
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index++;
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string::size_type split=result.rfind('/',result.length()-2);
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if (split!=string::npos) {
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if (result.substr(split)!="/../") {
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result.resize(split);
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}
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} else if (result.length()>0) {
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if ((result!="../")&&(result!="/")) {
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result.clear();
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}
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} else result="..";
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continue;
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} else {
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n=filePath[index+2];
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if (n=='/') {
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index+=2;
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string::size_type split=result.rfind('/',result.length()-2);
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if (split!=string::npos) {
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if (result.substr(split)!="/../") {
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result.resize(split+1);
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}
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} else if (result.length()>0) {
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if ((result!="../")&&(result!="/")) {
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result.clear();
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}
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} else result="../";
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continue;
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}
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}
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}
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}
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result+=c; hadSep=false;
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}
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return result;
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}
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bool DwarfReader::read_source_files(const std::string& fileName,std::list<std::string>& lines) {
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// Open The file
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int fd=open(fileName.c_str(),O_RDONLY);
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if (fd<0) return false;
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// Initialize libdwarf
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Dwarf_Debug dbg;
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int status = dwarf_init(fd, DW_DLC_READ,dwarfErrorHandler,0,&dbg,0);
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if (status==DW_DLV_ERROR) { close(fd); return false; }
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if (status==DW_DLV_NO_ENTRY) { close(fd); return true; }
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// Iterator over the headers
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Dwarf_Unsigned header;
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while (dwarf_next_cu_header(dbg,0,0,0,0,&header,0)==DW_DLV_OK) {
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// Access the die
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Dwarf_Die die;
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if (dwarf_siblingof(dbg,0,&die,0)!=DW_DLV_OK)
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return false;
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// Get the source lines
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Dwarf_Line* lineBuffer;
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Dwarf_Signed lineCount;
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if (dwarf_srclines(die,&lineBuffer,&lineCount,0)!=DW_DLV_OK)
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continue; //return false;
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// Store them
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for (int index=0;index<lineCount;index++) {
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Dwarf_Unsigned lineNo;
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if (dwarf_lineno(lineBuffer[index],&lineNo,0)!=DW_DLV_OK)
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return false;
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char* lineSource;
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if (dwarf_linesrc(lineBuffer[index],&lineSource,0)!=DW_DLV_OK)
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return false;
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Dwarf_Bool isCode;
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if (dwarf_linebeginstatement(lineBuffer[index],&isCode,0)!=DW_DLV_OK)
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return false;
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Dwarf_Addr addr;
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if (dwarf_lineaddr(lineBuffer[index],&addr,0)!=DW_DLV_OK)
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return false;
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if (lineNo&&isCode) {
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//LOG << "lineNo: " << lineNo << " addr: " << reinterpret_cast<void*>(addr) << " line source:" << normalize(lineSource) << endl;
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lines.push_back(normalize(lineSource));
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}
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dwarf_dealloc(dbg,lineSource,DW_DLA_STRING);
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}
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// Release the memory
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for (int index=0;index<lineCount;index++)
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dwarf_dealloc(dbg,lineBuffer[index],DW_DLA_LINE);
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dwarf_dealloc(dbg,lineBuffer,DW_DLA_LIST);
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}
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//Remove duplicated entrys
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lines.sort();
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lines.unique();
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// Shut down libdwarf
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if (dwarf_finish(dbg,0)!=DW_DLV_OK)
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return false;
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close(fd);
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return true;
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}
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bool DwarfReader::read_mapping(std::string fileName, std::list<addrToLine>& addrToLineList) {
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// Open The file
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int fd=open(fileName.c_str(),O_RDONLY);
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if (fd<0) {
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return false;
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}
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// Initialize libdwarf
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Dwarf_Debug dbg;
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int status = dwarf_init(fd, DW_DLC_READ,dwarfErrorHandler,0,&dbg,0);
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if (status==DW_DLV_ERROR) {
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close(fd);
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return false;
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}
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if (status==DW_DLV_NO_ENTRY) {
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close(fd);
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return true;
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}
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// Iterator over the headers
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Dwarf_Unsigned header;
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while (dwarf_next_cu_header(dbg,0,0,0,0,&header,0)==DW_DLV_OK) {
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// Access the die
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Dwarf_Die die;
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if (dwarf_siblingof(dbg,0,&die,0)!=DW_DLV_OK) {
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return false;
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}
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// Get the source lines
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Dwarf_Line* lineBuffer;
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Dwarf_Signed lineCount;
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if (dwarf_srclines(die,&lineBuffer,&lineCount,0)!=DW_DLV_OK) {
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continue; //return false;
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}
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// Store them
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for (int index=0;index<lineCount;index++) {
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Dwarf_Unsigned lineNo;
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if (dwarf_lineno(lineBuffer[index],&lineNo,0)!=DW_DLV_OK) {
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return false;
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}
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char* lineSource;
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if (dwarf_linesrc(lineBuffer[index],&lineSource,0)!=DW_DLV_OK) {
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return false;
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}
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Dwarf_Bool isCode;
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if (dwarf_linebeginstatement(lineBuffer[index],&isCode,0)!=DW_DLV_OK) {
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return false;
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}
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Dwarf_Addr addr;
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if (dwarf_lineaddr(lineBuffer[index],&addr,0)!=DW_DLV_OK) {
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return false;
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}
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if (lineNo&&isCode) {
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struct addrToLine newLine = { (int) addr, (int) lineNo, normalize(lineSource) };
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addrToLineList.push_back(newLine);
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}
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dwarf_dealloc(dbg,lineSource,DW_DLA_STRING);
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}
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// Release the memory
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for (int index=0;index<lineCount;index++) {
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dwarf_dealloc(dbg,lineBuffer[index],DW_DLA_LINE);
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}
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dwarf_dealloc(dbg,lineBuffer,DW_DLA_LIST);
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}
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// Shut down libdwarf
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if (dwarf_finish(dbg,0)!=DW_DLV_OK) {
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return false;
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}
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close(fd);
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return true;
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}
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