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Instead of using recursively applied templates to accumulate a series of wrapper lambdas which dispatch to a call, use pure parameter pack expansion. This has two benefits. One, it makes the code simpler(ish) and easier to understand. The parameter pack machinery is still intrinsically fairly tricky, but there's less of it and it's a fairly straightforward application of that mechanism. Also, a nice side benefit is that the template for simcall dispatch will expand to a small fixed number of functions which do all their work locally, instead of having a new function for each layer of the onion, one per parameter, and no calls through lambdas. That should hopefully make debugging easier, and produce less bookkeeping overhead as far as really long names, lots of functions, etc. This code, specifically the code in dispatch.hh, can be simplified even further in the future once we start using c++17 which is if constexpr, and std::apply which explodes a tuple and uses its components as arguments to a function, something I'm doing manually here. Change-Id: If7c9234cc1014101211474c2ec20362702cf78c2 Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/41600 Reviewed-by: Gabe Black <gabe.black@gmail.com> Maintainer: Gabe Black <gabe.black@gmail.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, SWIG, 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 the aforementioned tools. Once you have all dependencies resolved, type 'scons build/<ARCH>/gem5.opt' where ARCH is one of ARM, NULL, MIPS, POWER, SPARC, or X86. This will build an optimized version of the gem5 binary (gem5.opt) for the the specified architecture. See http://www.gem5.org/documentation/general_docs/building for more details and options. The basic source release includes these subdirectories: - configs: example simulation configuration scripts - ext: less-common external packages needed to build gem5 - 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 will need compiled system firmware (console and PALcode for Alpha), kernel binaries and one or more disk images. If you have questions, please send mail to gem5-users@gem5.org Enjoy using gem5 and please share your modifications and extensions.