mirror of
https://github.com/classilla/tenfourfox.git
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89 lines
2.9 KiB
C++
89 lines
2.9 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 SPS 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
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read_procmaps(lul::LUL* aLUL)
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{
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MOZ_ASSERT(aLUL->CountMappings() == 0);
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# if defined(SPS_OS_linux) || defined(SPS_OS_android) || defined(SPS_OS_darwin)
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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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# if defined(SPS_OS_android) && !defined(MOZ_WIDGET_GONK)
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// We're using faulty.lib. Use a special-case object mapper.
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AutoObjectMapperFaultyLib mapper(aLUL->mLog);
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# else
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// We can use the standard POSIX-based mapper.
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AutoObjectMapperPOSIX mapper(aLUL->mLog);
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# endif
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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, lib.GetName());
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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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lib.GetName().c_str(), image);
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} else if (!ok && lib.GetName() == "") {
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// The object has no name and (as a consequence) the mapper
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// failed to map it. This happens on Linux, where
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// GetInfoForSelf() produces two such mappings: one for the
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// executable and one for the VDSO. The executable one isn't a
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// big deal since there's not much interesting code in there,
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// but the VDSO one is a problem on x86-{linux,android} because
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// lack of knowledge about the mapped area inhibits LUL's
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// special __kernel_syscall handling. Hence notify |aLUL| at
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// least of the mapping, even though it can't read any unwind
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// 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
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logging_sink_for_LUL(const char* str) {
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// Ignore any trailing \n, since LOG will add one anyway.
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size_t n = strlen(str);
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if (n > 0 && str[n-1] == '\n') {
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char* tmp = strdup(str);
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tmp[n-1] = 0;
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LOG(tmp);
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free(tmp);
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} else {
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LOG(str);
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}
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}
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