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/**
* @file llstacktrace.cpp
* @brief stack tracing functionality
*
* $LicenseInfo:firstyear=2001&license=viewergpl$
*
* Copyright (c) 2001-2009, Linden Research, Inc.
*
* Second Life Viewer Source Code
* The source code in this file ("Source Code") is provided by Linden Lab
* to you under the terms of the GNU General Public License, version 2.0
* ("GPL"), unless you have obtained a separate licensing agreement
* ("Other License"), formally executed by you and Linden Lab. Terms of
* the GPL can be found in doc/GPL-license.txt in this distribution, or
* online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
*
* There are special exceptions to the terms and conditions of the GPL as
* it is applied to this Source Code. View the full text of the exception
* in the file doc/FLOSS-exception.txt in this software distribution, or
* online at
* http://secondlifegrid.net/programs/open_source/licensing/flossexception
*
* By copying, modifying or distributing this software, you acknowledge
* that you have read and understood your obligations described above,
* and agree to abide by those obligations.
*
* ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
* WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
* COMPLETENESS OR PERFORMANCE.
* $/LicenseInfo$
*/
#include "linden_common.h"
#include "llstacktrace.h"
#ifdef LL_WINDOWS
#include <iostream>
#include <sstream>
#include "windows.h"
#include "Dbghelp.h"
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;
}
#else
bool ll_get_stack_trace(std::vector<std::string>& lines)
{
return false;
}
#endif
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