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/**
* @file llstacktrace.cpp
* @brief stack tracing functionality
*
* $LicenseInfo:firstyear=2001&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2010, Linden Research, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License only.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
* $/LicenseInfo$
*/
#include "linden_common.h"
#include "llstacktrace.h"
#ifdef LL_WINDOWS
#include <iostream>
#include <sstream>
#include "llwin32headerslean.h"
#pragma warning (push)
#pragma warning (disable:4091) // a microsoft header has warnings. Very nice.
#include <dbghelp.h>
#pragma warning (pop)
typedef USHORT NTAPI RtlCaptureStackBackTrace_Function(
IN ULONG frames_to_skip,
IN ULONG frames_to_capture,
OUT PVOID *backtrace,
OUT PULONG backtrace_hash);
static RtlCaptureStackBackTrace_Function* const RtlCaptureStackBackTrace_fn =
(RtlCaptureStackBackTrace_Function*)
GetProcAddress(GetModuleHandleA("ntdll.dll"), "RtlCaptureStackBackTrace");
bool ll_get_stack_trace(std::vector<std::string>& lines)
{
const S32 MAX_STACK_DEPTH = 32;
const S32 STRING_NAME_LENGTH = 200;
const S32 FRAME_SKIP = 2;
static BOOL symbolsLoaded = false;
static BOOL firstCall = true;
HANDLE hProc = GetCurrentProcess();
// load the symbols if they're not loaded
if(!symbolsLoaded && firstCall)
{
symbolsLoaded = SymInitialize(hProc, NULL, true);
firstCall = false;
}
// if loaded, get the call stack
if(symbolsLoaded)
{
// create the frames to hold the addresses
void* frames[MAX_STACK_DEPTH];
memset(frames, 0, sizeof(void*)*MAX_STACK_DEPTH);
S32 depth = 0;
// get the addresses
depth = RtlCaptureStackBackTrace_fn(FRAME_SKIP, MAX_STACK_DEPTH, frames, NULL);
IMAGEHLP_LINE64 line;
memset(&line, 0, sizeof(IMAGEHLP_LINE64));
line.SizeOfStruct = sizeof(IMAGEHLP_LINE64);
// create something to hold address info
PIMAGEHLP_SYMBOL64 pSym;
pSym = (PIMAGEHLP_SYMBOL64)malloc(sizeof(IMAGEHLP_SYMBOL64) + STRING_NAME_LENGTH);
memset(pSym, 0, sizeof(IMAGEHLP_SYMBOL64) + STRING_NAME_LENGTH);
pSym->MaxNameLength = STRING_NAME_LENGTH;
pSym->SizeOfStruct = sizeof(IMAGEHLP_SYMBOL64);
// get address info for each address frame
// and store
for(S32 i=0; i < depth; i++)
{
std::stringstream stack_line;
BOOL ret;
DWORD64 addr = (DWORD64)frames[i];
ret = SymGetSymFromAddr64(hProc, addr, 0, pSym);
if(ret)
{
stack_line << pSym->Name << " ";
}
DWORD dummy;
ret = SymGetLineFromAddr64(hProc, addr, &dummy, &line);
if(ret)
{
std::string file_name = line.FileName;
std::string::size_type index = file_name.rfind("\\");
stack_line << file_name.substr(index + 1, file_name.size()) << ":" << line.LineNumber;
}
lines.push_back(stack_line.str());
}
free(pSym);
// TODO: figure out a way to cleanup symbol loading
// Not hugely necessary, however.
//SymCleanup(hProc);
return true;
}
else
{
lines.push_back("Stack Trace Failed. PDB symbol info not loaded");
}
return false;
}
void ll_get_stack_trace_internal(std::vector<std::string>& lines)
{
const S32 MAX_STACK_DEPTH = 100;
const S32 STRING_NAME_LENGTH = 256;
HANDLE process = GetCurrentProcess();
SymInitialize( process, NULL, TRUE );
void *stack[MAX_STACK_DEPTH];
unsigned short frames = RtlCaptureStackBackTrace_fn( 0, MAX_STACK_DEPTH, stack, NULL );
SYMBOL_INFO *symbol = (SYMBOL_INFO*)calloc(sizeof(SYMBOL_INFO) + STRING_NAME_LENGTH * sizeof(char), 1);
symbol->MaxNameLen = STRING_NAME_LENGTH-1;
symbol->SizeOfStruct = sizeof(SYMBOL_INFO);
for(unsigned int i = 0; i < frames; i++)
{
SymFromAddr(process, (DWORD64)(stack[i]), 0, symbol);
lines.push_back(symbol->Name);
}
free( symbol );
}
#else
bool ll_get_stack_trace(std::vector<std::string>& lines)
{
return false;
}
void ll_get_stack_trace_internal(std::vector<std::string>& lines)
{
}
#endif
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