mirror of
https://github.com/mozilla/gecko-dev.git
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30e17cfd82
This changeset replaces all of the
// char16_t[]
optional bytes someProperty = 1;
one- and two-byte string properties in the CoreDump.proto protobuf definition
file with:
oneof {
// char16_t[]
bytes someProperty = 1;
uint64 somePropertyRef = 2;
}
The first time the N^th unique string is serialized, then someProperty is used
and the full string is serialized in the protobuf message. All following times
that string is serialized, somePropertyRef is used and its value is N.
Among the other things, this also changes JS::ubi::Edge::name from a raw pointer
with commented rules about who does or doesn't own and should and shouldn't free
the raw pointer to a UniquePtr that enforces those rules rather than relying on
developers reading and obeying the rules in the comments.
76 lines
2.1 KiB
C++
76 lines
2.1 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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#ifndef mozilla_devtools_AutoMemMap_h
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#define mozilla_devtools_AutoMemMap_h
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#include <prio.h>
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#include "mozilla/GuardObjects.h"
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namespace mozilla {
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namespace devtools {
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// # AutoMemMap
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//
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// AutoMemMap is an RAII class to manage mapping a file to memory. It is a
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// wrapper aorund managing opening and closing a file and calling PR_MemMap and
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// PR_MemUnmap.
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//
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// Example usage:
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//
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// {
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// AutoMemMap mm;
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// if (NS_FAILED(mm.init("/path/to/desired/file"))) {
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// // Handle the error however you see fit.
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// return false;
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// }
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//
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// doStuffWithMappedMemory(mm.address());
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// }
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// // The memory is automatically unmapped when the AutoMemMap leaves scope.
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class MOZ_RAII AutoMemMap
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{
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MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER;
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PRFileInfo64 fileInfo;
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PRFileDesc* fd;
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PRFileMap* fileMap;
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void* addr;
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AutoMemMap(const AutoMemMap& aOther) = delete;
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void operator=(const AutoMemMap& aOther) = delete;
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public:
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explicit AutoMemMap(MOZ_GUARD_OBJECT_NOTIFIER_ONLY_PARAM)
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: fd(nullptr)
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, fileMap(nullptr)
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, addr(nullptr)
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{
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MOZ_GUARD_OBJECT_NOTIFIER_INIT;
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};
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~AutoMemMap();
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// Initialize this AutoMemMap.
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nsresult init(const char* filePath, PRIntn flags = PR_RDONLY, PRIntn mode = 0,
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PRFileMapProtect prot = PR_PROT_READONLY);
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// Get the size of the memory mapped file.
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uint32_t size() const {
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MOZ_ASSERT(fileInfo.size <= UINT32_MAX,
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"Should only call size() if init() succeeded.");
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return uint32_t(fileInfo.size);
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}
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// Get the mapped memory.
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void* address() { MOZ_ASSERT(addr); return addr; }
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const void* address() const { MOZ_ASSERT(addr); return addr; }
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};
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} // namespace devtools
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} // namespace mozilla
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#endif // mozilla_devtools_AutoMemMap_h
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