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When an object is a field in a union, it's the programmer's resposibility to destroy it from the union's destructor. We can simply neglect to do that and avoid having to use new to create the flags. Also, we can define the flags as inline variables (a c++17 feature), and then create a constexpr references to them. This lets us refer to debug flags in constexpr objects, although we can't interact with them at, for instance, construciton time or we'd lose our own constexpr-ness since the actual object is not constexpr. In c++20 we would hypothetically be able to use constexpr with new and delete, but there may be additional restrictions that would make this particular use impossible. Also this avoids leaking memory, which, even though it's intentional, may confuse tools like valgrind. Also, we need to ensure that all headers are included in some source file so that they exist in the final executable, so that they show up in the help, can be enabled/disabled, etc. Change-Id: Ia43111d938e7af7140b1c17dd68135f426d0a1e9 Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/49783 Maintainer: Gabe Black <gabe.black@gmail.com> Reviewed-by: Jui-min Lee <fcrh@google.com> Tested-by: kokoro <noreply+kokoro@google.com>
This is the gem5 simulator. The main website can be found at http://www.gem5.org A good starting point is http://www.gem5.org/about, and for more information about building the simulator and getting started please see http://www.gem5.org/documentation and http://www.gem5.org/documentation/learning_gem5/introduction. To build gem5, you will need the following software: g++ or clang, Python (gem5 links in the Python interpreter), SCons, zlib, m4, and lastly protobuf if you want trace capture and playback support. Please see http://www.gem5.org/documentation/general_docs/building for more details concerning the minimum versions of these tools. Once you have all dependencies resolved, type 'scons build/<CONFIG>/gem5.opt' where CONFIG is one of the options in build_opts like ARM, NULL, MIPS, POWER, SPARC, X86, Garnet_standalone, etc. This will build an optimized version of the gem5 binary (gem5.opt) with the the specified configuration. See http://www.gem5.org/documentation/general_docs/building for more details and options. The main source tree includes these subdirectories: - build_opts: pre-made default configurations for gem5 - build_tools: tools used internally by gem5's build process. - configs: example simulation configuration scripts - ext: less-common external packages needed to build gem5 - include: include files for use in other programs - site_scons: modular components of the build system - src: source code of the gem5 simulator - system: source for some optional system software for simulated systems - tests: regression tests - util: useful utility programs and files To run full-system simulations, you may need compiled system firmware, kernel binaries and one or more disk images, depending on gem5's configuration and what type of workload you're trying to run. Many of those resources can be downloaded from http://resources.gem5.org, and/or from the git repository here: https://gem5.googlesource.com/public/gem5-resources/ If you have questions, please send mail to gem5-users@gem5.org Enjoy using gem5 and please share your modifications and extensions.