From 36d22d82aa202bb199967e9512281e9a53db42c9 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 21:33:14 +0200 Subject: Adding upstream version 115.7.0esr. Signed-off-by: Daniel Baumann --- mozglue/baseprofiler/lul/AutoObjectMapper.h | 64 +++++++++++++++++++++++++++++ 1 file changed, 64 insertions(+) create mode 100644 mozglue/baseprofiler/lul/AutoObjectMapper.h (limited to 'mozglue/baseprofiler/lul/AutoObjectMapper.h') diff --git a/mozglue/baseprofiler/lul/AutoObjectMapper.h b/mozglue/baseprofiler/lul/AutoObjectMapper.h new file mode 100644 index 0000000000..f63aa43e0e --- /dev/null +++ b/mozglue/baseprofiler/lul/AutoObjectMapper.h @@ -0,0 +1,64 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=8 sts=2 et sw=2 tw=80: */ +/* 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/. */ + +#ifndef AutoObjectMapper_h +#define AutoObjectMapper_h + +#include + +#include "mozilla/Attributes.h" +#include "PlatformMacros.h" + +// A (nearly-) RAII class that maps an object in and then unmaps it on +// destruction. This base class version uses the "normal" POSIX +// functions: open, fstat, close, mmap, munmap. + +class MOZ_STACK_CLASS AutoObjectMapperPOSIX { + public: + // The constructor does not attempt to map the file, because that + // might fail. Instead, once the object has been constructed, + // call Map() to attempt the mapping. There is no corresponding + // Unmap() since the unmapping is done in the destructor. Failure + // messages are sent to |aLog|. + explicit AutoObjectMapperPOSIX(void (*aLog)(const char*)); + + // Unmap the file on destruction of this object. + ~AutoObjectMapperPOSIX(); + + // Map |fileName| into the address space and return the mapping + // extents. If the file is zero sized this will fail. The file is + // mapped read-only and private. Returns true iff the mapping + // succeeded, in which case *start and *length hold its extent. + // Once a call to Map succeeds, all subsequent calls to it will + // fail. + bool Map(/*OUT*/ void** start, /*OUT*/ size_t* length, std::string fileName); + + protected: + // If we are currently holding a mapped object, these record the + // mapped address range. + void* mImage; + size_t mSize; + + // A logging sink, for complaining about mapping failures. + void (*mLog)(const char*); + + private: + // Are we currently holding a mapped object? This is private to + // the base class. Derived classes need to have their own way to + // track whether they are holding a mapped object. + bool mIsMapped; + + // Disable copying and assignment. + AutoObjectMapperPOSIX(const AutoObjectMapperPOSIX&); + AutoObjectMapperPOSIX& operator=(const AutoObjectMapperPOSIX&); + // Disable heap allocation of this class. + void* operator new(size_t); + void* operator new[](size_t); + void operator delete(void*); + void operator delete[](void*); +}; + +#endif // AutoObjectMapper_h -- cgit v1.2.3