зеркало из https://github.com/mozilla/gecko-dev.git
74 строки
2.7 KiB
C++
74 строки
2.7 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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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#include <stdio.h>
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#include <signal.h>
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#include <string.h>
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#include <stdlib.h>
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#include <time.h>
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#include "platform.h"
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#include "PlatformMacros.h"
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#include "LulMain.h"
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#include "shared-libraries.h"
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#include "AutoObjectMapper.h"
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// Contains miscellaneous helpers that are used to connect the Gecko Profiler
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// and LUL.
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// Find out, in a platform-dependent way, where the code modules got
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// mapped in the process' virtual address space, and get |aLUL| to
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// load unwind info for them.
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void read_procmaps(lul::LUL* aLUL) {
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MOZ_ASSERT(aLUL->CountMappings() == 0);
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#if defined(GP_OS_linux) || defined(GP_OS_android) || defined(GP_OS_freebsd)
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SharedLibraryInfo info = SharedLibraryInfo::GetInfoForSelf();
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for (size_t i = 0; i < info.GetSize(); i++) {
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const SharedLibrary& lib = info.GetEntry(i);
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std::string nativePath = lib.GetNativeDebugPath();
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// We can use the standard POSIX-based mapper.
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AutoObjectMapperPOSIX mapper(aLUL->mLog);
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// Ask |mapper| to map the object. Then hand its mapped address
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// to NotifyAfterMap().
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void* image = nullptr;
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size_t size = 0;
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bool ok = mapper.Map(&image, &size, nativePath);
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if (ok && image && size > 0) {
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aLUL->NotifyAfterMap(lib.GetStart(), lib.GetEnd() - lib.GetStart(),
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nativePath.c_str(), image);
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} else if (!ok && lib.GetDebugName().IsEmpty()) {
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// The object has no name and (as a consequence) the mapper failed to map
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// it. This happens on Linux, where GetInfoForSelf() produces such a
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// mapping for the VDSO. This is a problem on x86-{linux,android} because
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// lack of knowledge about the mapped area inhibits LUL's special
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// __kernel_syscall handling. Hence notify |aLUL| at least of the
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// mapping, even though it can't read any unwind information for the area.
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aLUL->NotifyExecutableArea(lib.GetStart(), lib.GetEnd() - lib.GetStart());
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}
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// |mapper| goes out of scope at this point and so its destructor
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// unmaps the object.
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}
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#else
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# error "Unknown platform"
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#endif
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}
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// LUL needs a callback for its logging sink.
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void logging_sink_for_LUL(const char* str) {
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// These are only printed when Verbose logging is enabled (e.g. with
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// MOZ_LOG="prof:5"). This is because LUL's logging is much more verbose than
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// the rest of the profiler's logging, which occurs at the Info (3) and Debug
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// (4) levels.
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MOZ_LOG(gProfilerLog, mozilla::LogLevel::Verbose,
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("[%d] %s", profiler_current_process_id(), str));
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}
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