EoaCore.cxx

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#include <cstring>
#include <cstdlib>

#include "EoaCore.hxx"
#include "Demangle.hxx"

#ifdef _GNU_SOURCE
#include <execinfo.h>
#endif

unsigned int EoaCore::gBacktraceSymbols = 5;

EoaCore::EoaCore() {
    fWhat[0] = 0;
#ifdef _GNU_SOURCE
    if (gBacktraceSymbols>0) {
        const unsigned int bufferSize=100;
        if (gBacktraceSymbols>bufferSize) gBacktraceSymbols = bufferSize;
        void *buffer[bufferSize];
        unsigned int frames = bufferSize;
        if (gBacktraceSymbols<frames) frames = gBacktraceSymbols;
        int nFrames = backtrace(buffer,frames);
        char **symbols = backtrace_symbols(buffer,nFrames);
        if (symbols != NULL) {
            unsigned int len = 0;
            std::strcat(fWhat,"Backtrace:\n");
            for (int i = 0; i<nFrames; ++i) {
                std::string sym(symbols[i]);
                std::string lib;
                std::string::size_type s = sym.find_last_of('/');
                if (s != std::string::npos) sym = sym.substr(s+1);
                s = sym.find_first_of('(');
                if (s != std::string::npos) lib = sym.substr(0,s);
                sym = sym.substr(s+1);
                std::string::size_type t = sym.find_first_of(')');
                if (s != std::string::npos
                    && t != std::string::npos) sym = sym.substr(0,t);
                else sym="";
                if (lib.empty() && sym.empty()) continue;
                len += lib.length();
                len += sym.length() + 6;
                if (2*len>sizeof(fWhat)) break;
                std::strcat(fWhat," --> ");
                if (!lib.empty()) std::strcat(fWhat,lib.c_str());
                if (!sym.empty()) {
                    std::strcat(fWhat,": ");
                    std::strcat(fWhat,sym.c_str());
                }
                std::strcat(fWhat,"\n");
            }
            std::free(symbols);
        }
    }
#endif
    std::strcat(fWhat,"Exception:  EoaCore");
}

void EoaCore::AppendWhat(const char* child) {
    unsigned int wLen = std::strlen(fWhat);
    unsigned int cLen = std::strlen(child);
    if (wLen+cLen < sizeof(fWhat)-5) {
        std::strcat(fWhat,"::");
        std::strcat(fWhat,child);
    }
}