mozglue/baseprofiler/lul/platform-linux-lul.cpp
author Masayuki Nakano <masayuki@d-toybox.com>
Sun, 16 Jan 2022 06:21:17 +0000
changeset 604634 9ef0614a59629916c1e182eb8eda055b0b0e8b32
parent 537537 7c27fcb3b1832e5f83a6c50d74e1d14f666ae0cd
permissions -rw-r--r--
Bug 1749299 - Make `HTMLEditor::HandleInsertLinefeed()` stop handling it if insertion point cannot have text nodes r=m_kato Ideally, it should not be called when the editor cannot insert new text node. However, the callers are complicated. Therefore, let's check in it for avoiding making the callers more complicated. Fortunately, this is not realistic path for normal web apps. Therefore, the compatibility of the behavior is not matter. That's the reason why this patch does not have a test comparing the result. Differential Revision: https://phabricator.services.mozilla.com/D135826

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 <stdio.h>
#include <signal.h>
#include <string.h>
#include <stdlib.h>
#include <time.h>

#include "AutoObjectMapper.h"
#include "BaseProfiler.h"
#include "BaseProfilerSharedLibraries.h"
#include "platform.h"
#include "PlatformMacros.h"
#include "LulMain.h"

// Contains miscellaneous helpers that are used to connect the Gecko Profiler
// and LUL.

// Find out, in a platform-dependent way, where the code modules got
// mapped in the process' virtual address space, and get |aLUL| to
// load unwind info for them.
void read_procmaps(lul::LUL* aLUL) {
  MOZ_ASSERT(aLUL->CountMappings() == 0);

#if defined(GP_OS_linux) || defined(GP_OS_android) || defined(GP_OS_freebsd)
  SharedLibraryInfo info = SharedLibraryInfo::GetInfoForSelf();

  for (size_t i = 0; i < info.GetSize(); i++) {
    const SharedLibrary& lib = info.GetEntry(i);

    std::string nativePath = lib.GetDebugPath();

    // We can use the standard POSIX-based mapper.
    AutoObjectMapperPOSIX mapper(aLUL->mLog);

    // Ask |mapper| to map the object.  Then hand its mapped address
    // to NotifyAfterMap().
    void* image = nullptr;
    size_t size = 0;
    bool ok = mapper.Map(&image, &size, nativePath);
    if (ok && image && size > 0) {
      aLUL->NotifyAfterMap(lib.GetStart(), lib.GetEnd() - lib.GetStart(),
                           nativePath.c_str(), image);
    } else if (!ok && lib.GetDebugName().empty()) {
      // The object has no name and (as a consequence) the mapper failed to map
      // it.  This happens on Linux, where GetInfoForSelf() produces such a
      // mapping for the VDSO.  This is a problem on x86-{linux,android} because
      // lack of knowledge about the mapped area inhibits LUL's special
      // __kernel_syscall handling.  Hence notify |aLUL| at least of the
      // mapping, even though it can't read any unwind information for the area.
      aLUL->NotifyExecutableArea(lib.GetStart(), lib.GetEnd() - lib.GetStart());
    }

    // |mapper| goes out of scope at this point and so its destructor
    // unmaps the object.
  }

#else
#  error "Unknown platform"
#endif
}

// LUL needs a callback for its logging sink.
void logging_sink_for_LUL(const char* str) {
  // These are only printed when Verbose logging is enabled (e.g. with
  // MOZ_BASE_PROFILER_VERBOSE_LOGGING=1). This is because LUL's logging is much
  // more verbose than the rest of the profiler's logging, which occurs at the
  // Info (3) and Debug (4) levels.
  // FIXME: This causes a build failure in memory/replace/dmd/test/SmokeDMD (!)
  // and other places, because it doesn't link the implementation in
  // platform.cpp.
  // VERBOSE_LOG("[%d] %s", profiler_current_process_id(), str);
}