зеркало из https://github.com/mozilla/gecko-dev.git
131 строка
4.0 KiB
C++
131 строка
4.0 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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 "BaseProfiler.h"
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#ifdef MOZ_BASE_PROFILER
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# include <sys/mman.h>
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# include <unistd.h>
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# include <sys/types.h>
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# include <sys/stat.h>
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# include <fcntl.h>
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# include "mozilla/Assertions.h"
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# include "mozilla/Sprintf.h"
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# include "PlatformMacros.h"
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# include "AutoObjectMapper.h"
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# if defined(GP_OS_android)
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# include <dlfcn.h>
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# include "mozilla/Types.h"
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// FIXME move these out of mozglue/linker/ElfLoader.h into their
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// own header, so as to avoid conflicts arising from two definitions
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// of Array
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extern "C" {
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MFBT_API size_t __dl_get_mappable_length(void* handle);
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MFBT_API void* __dl_mmap(void* handle, void* addr, size_t length, off_t offset);
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MFBT_API void __dl_munmap(void* handle, void* addr, size_t length);
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}
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# endif
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// A helper function for creating failure error messages in
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// AutoObjectMapper*::Map.
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static void failedToMessage(void (*aLog)(const char*), const char* aHowFailed,
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std::string aFileName) {
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char buf[300];
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SprintfLiteral(buf, "AutoObjectMapper::Map: Failed to %s \'%s\'", aHowFailed,
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aFileName.c_str());
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buf[sizeof(buf) - 1] = 0;
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aLog(buf);
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}
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AutoObjectMapperPOSIX::AutoObjectMapperPOSIX(void (*aLog)(const char*))
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: mImage(nullptr), mSize(0), mLog(aLog), mIsMapped(false) {}
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AutoObjectMapperPOSIX::~AutoObjectMapperPOSIX() {
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if (!mIsMapped) {
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// There's nothing to do.
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MOZ_ASSERT(!mImage);
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MOZ_ASSERT(mSize == 0);
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return;
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}
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MOZ_ASSERT(mSize > 0);
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// The following assertion doesn't necessarily have to be true,
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// but we assume (reasonably enough) that no mmap facility would
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// be crazy enough to map anything at page zero.
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MOZ_ASSERT(mImage);
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munmap(mImage, mSize);
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}
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bool AutoObjectMapperPOSIX::Map(/*OUT*/ void** start, /*OUT*/ size_t* length,
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std::string fileName) {
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MOZ_ASSERT(!mIsMapped);
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int fd = open(fileName.c_str(), O_RDONLY);
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if (fd == -1) {
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failedToMessage(mLog, "open", fileName);
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return false;
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}
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struct stat st;
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int err = fstat(fd, &st);
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size_t sz = (err == 0) ? st.st_size : 0;
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if (err != 0 || sz == 0) {
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failedToMessage(mLog, "fstat", fileName);
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close(fd);
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return false;
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}
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void* image = mmap(nullptr, sz, PROT_READ, MAP_SHARED, fd, 0);
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if (image == MAP_FAILED) {
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failedToMessage(mLog, "mmap", fileName);
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close(fd);
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return false;
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}
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close(fd);
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mIsMapped = true;
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mImage = *start = image;
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mSize = *length = sz;
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return true;
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}
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# if defined(GP_OS_android)
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AutoObjectMapperFaultyLib::AutoObjectMapperFaultyLib(void (*aLog)(const char*))
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: AutoObjectMapperPOSIX(aLog), mHdl(nullptr) {}
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AutoObjectMapperFaultyLib::~AutoObjectMapperFaultyLib() {
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if (mHdl) {
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// We've got an object mapped by faulty.lib. Unmap it via faulty.lib.
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MOZ_ASSERT(mSize > 0);
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// Assert on the basis that no valid mapping would start at page zero.
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MOZ_ASSERT(mImage);
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__dl_munmap(mHdl, mImage, mSize);
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dlclose(mHdl);
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// Stop assertions in ~AutoObjectMapperPOSIX from failing.
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mImage = nullptr;
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mSize = 0;
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}
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// At this point the parent class destructor, ~AutoObjectMapperPOSIX,
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// gets called. If that has something mapped in the normal way, it
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// will unmap it in the normal way. Unfortunately there's no
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// obvious way to enforce the requirement that the object is mapped
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// either by faulty.lib or by the parent class, but not by both.
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}
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bool AutoObjectMapperFaultyLib::Map(/*OUT*/ void** start,
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/*OUT*/ size_t* length,
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std::string fileName) {
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MOZ_ASSERT(!mHdl);
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return false;
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}
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# endif // defined(GP_OS_android)
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#endif // MOZ_BASE_PROFILER
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