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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include <vespa/vespalib/util/backtrace.h>
#include <vespa/vespalib/util/classname.h>
#include <vespa/vespalib/stllike/string.h>
#include <vespa/vespalib/stllike/asciistream.h>
#include <execinfo.h>
#include <csignal>
namespace {
/**
* Convert input line of form eg.
* ./exception_test(_ZN11Application5entryEiPPc+0x0) [0x1234]
* to its demangled form
* ./exception_test(Application::entry(int, char**)+0x0) [0x1234]
*
* Assumes everything between '(' and '+' is a mangled function signature.
*
* @param line A single line from backtrace_symbols
* @return The demangled line or the original line if demangling fails
*/
vespalib::string
demangleBacktraceLine(const vespalib::string& line)
{
size_t symBegin = line.find_first_of('(');
if (symBegin != vespalib::string::npos) {
size_t symEnd = line.find_first_of('+', symBegin);
if (symEnd != vespalib::string::npos) {
vespalib::string mangled = line.substr(symBegin + 1, symEnd - symBegin - 1);
vespalib::string demangled = vespalib::demangle(mangled.c_str());
if ( ! demangled.empty()) {
// Create string matching original backtrace line format,
// except with demangled function signature
vespalib::string ret(line.c_str(), symBegin + 1);
ret.append(demangled);
ret.append(line.c_str() + symEnd);
return ret;
}
}
}
// Return unchanged since we couldn't make sense of it
return line;
}
}
int
vespalib::getStackTraceFrames(void** framesOut, int maxFrames) {
return backtrace(framesOut, maxFrames);
}
vespalib::string
vespalib::getStackTrace(int ignoreTop, void* const* stack, int size)
{
asciistream ost;
char** symbols = backtrace_symbols(stack, size);
if (symbols) {
ost << "Backtrace:";
for (int i = ignoreTop; i < size; ++i) {
ost << "\n " << demangleBacktraceLine(symbols[i]);
}
free(symbols);
}
return ost.str();
}
vespalib::string
vespalib::getStackTrace(int ignoreTop) {
ignoreTop += 1;
void* stack[25];
int size = backtrace(stack, 25);
return getStackTrace(ignoreTop, stack, size);
}
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