106 lines
2.9 KiB
C++
106 lines
2.9 KiB
C++
/*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* Copyright 2016 Danny Robson <danny@nerdcruft.net>
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*/
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#include "backtrace.hpp"
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#include "debug.hpp"
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#include "types.hpp"
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#include "win32/except.hpp"
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#include "win32/windows.hpp"
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// windows.h needs to be included here so that it defines some symbols that
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// dbghelp.h requires.
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#include <windows.h>
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#include <dbghelp.h>
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#include <ostream>
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using debug::backtrace;
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///////////////////////////////////////////////////////////////////////////////
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backtrace::backtrace ()
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{
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if (!SymInitialize (GetCurrentProcess (), nullptr, TRUE))
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cruft::win32::error::throw_code ();
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CONTEXT ctx;
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memset (&ctx, 0, sizeof (ctx));
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ctx.ContextFlags = CONTEXT_ALL;
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RtlCaptureContext (&ctx);
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auto image_type = IMAGE_FILE_MACHINE_AMD64;
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STACKFRAME64 frame;
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memset (&frame, 0, sizeof (frame));
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frame.AddrPC.Offset = ctx.Rip;
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frame.AddrPC.Mode = AddrModeFlat;
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frame.AddrFrame.Offset = ctx.Rsp;
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frame.AddrFrame.Mode = AddrModeFlat;
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frame.AddrStack.Offset = ctx.Rsp;
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frame.AddrStack.Mode = AddrModeFlat;
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auto process = GetCurrentProcess ();
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auto thread = GetCurrentThread ();
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SetLastError (0);
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while (true) {
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if (!StackWalk64 (image_type,
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process,
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thread,
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&frame,
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&ctx,
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nullptr,
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SymFunctionTableAccess64,
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SymGetModuleBase64,
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nullptr))
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{
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cruft::win32::error::throw_code ();
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}
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// we've read the bottom of the stack
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if (frame.AddrReturn.Offset == 0)
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break;
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// we've reached the tail of an (apparently) infinite stack. this is a common occurence.
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if (frame.AddrPC.Offset == frame.AddrReturn.Offset)
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break;
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m_frames.push_back (reinterpret_cast<void*> (frame.AddrPC.Offset));
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}
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}
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///////////////////////////////////////////////////////////////////////////////
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std::ostream&
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debug::operator<< (std::ostream &os, const debug::backtrace &b)
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{
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const auto self = GetCurrentProcess ();
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struct {
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IMAGEHLP_SYMBOL64 info;
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char name[255];
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} sym;
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sym.info.SizeOfStruct = sizeof (sym.info);
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sym.info.MaxNameLength = std::size (sym.name);
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for (auto frame: b.frames ()) {
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// Find the symbol name
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sym.info.Name[0] = '\0';
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memset (sym.name, 0, sizeof (sym.name));
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SymGetSymFromAddr64 (self, reinterpret_cast<uintptr_t> (frame), nullptr, &sym.info);
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*std::rbegin (sym.name) = '\0';
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os << self << '\t' << frame << '\t' << sym.info.Name << '\n';
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}
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return os;
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}
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