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/* -*- 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 "platform.h"
#include "PlatformMacros.h"
#include "LulMain.h"
#include "shared-libraries.h"
#include "AutoObjectMapper.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.GetNativeDebugPath();
// 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().IsEmpty()) {
// 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_LOG="prof:5"). 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.
MOZ_LOG(gProfilerLog, mozilla::LogLevel::Verbose,
("[%d] %s", profiler_current_process_id(), str));
}
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