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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*/
#include <sal/config.h>
#include <limits>
#include <memory>
#if !defined WIN32_LEAN_AND_MEAN
# define WIN32_LEAN_AND_MEAN
#endif
#include <windows.h>
#include <process.h>
#include <iostream>
#define OPTIONAL
#include <DbgHelp.h>
#include <rtl/ustrbuf.hxx>
#include <sal/backtrace.hxx>
#include <backtraceasstring.hxx>
namespace {
template<typename T> T clampToULONG(T n) {
auto const maxUlong = std::numeric_limits<ULONG>::max();
return n > maxUlong ? static_cast<T>(maxUlong) : n;
}
}
OUString osl::detail::backtraceAsString(sal_uInt32 maxDepth)
{
std::unique_ptr<sal::BacktraceState> backtrace = sal::backtrace_get( maxDepth );
return sal::backtrace_to_string( backtrace.get());
}
std::unique_ptr<sal::BacktraceState> sal::backtrace_get(sal_uInt32 maxDepth)
{
assert(maxDepth != 0);
maxDepth = clampToULONG(maxDepth);
auto pStack = new void *[maxDepth];
// https://msdn.microsoft.com/en-us/library/windows/desktop/bb204633.aspx
// "CaptureStackBackTrace function" claims that you "can capture up to
// MAXUSHORT frames", and on Windows Server 2003 and Windows XP it even
// "must be less than 63", but assume that a too large input value is
// clamped internally, instead of resulting in an error:
int nFrames = CaptureStackBackTrace( 0, static_cast<ULONG>(maxDepth), pStack, nullptr );
return std::unique_ptr<BacktraceState>(new BacktraceState{ pStack, nFrames });
}
OUString sal::backtrace_to_string(BacktraceState* backtraceState)
{
HANDLE hProcess = GetCurrentProcess();
// https://docs.microsoft.com/en-us/windows/win32/api/dbghelp/nf-dbghelp-syminitialize
// says to not initialize more than once. This still leaks for some
// reason if called often enough.
static bool needsInit = true;
if( needsInit )
SymInitialize( hProcess, nullptr, true );
else
SymRefreshModuleList( hProcess );
SYMBOL_INFO * pSymbol;
pSymbol = static_cast<SYMBOL_INFO *>(calloc( sizeof( SYMBOL_INFO ) + 1024 * sizeof( char ), 1 ));
assert(pSymbol);
pSymbol->MaxNameLen = 1024 - 1;
pSymbol->SizeOfStruct = sizeof( SYMBOL_INFO );
auto nFrames = backtraceState->nDepth;
OUStringBuffer aBuf;
for( int i = 0; i < nFrames; i++ )
{
SymFromAddr( hProcess, reinterpret_cast<DWORD64>(backtraceState->buffer[ i ]), nullptr, pSymbol );
aBuf.append( static_cast<sal_Int32>(nFrames - i - 1) );
aBuf.append( ": " );
aBuf.appendAscii( pSymbol->Name );
aBuf.append( " - 0x" );
aBuf.append( static_cast<sal_Int64>(pSymbol->Address), 16 );
aBuf.append( "\n" );
}
free( pSymbol );
return aBuf.makeStringAndClear();
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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