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The code in the body of a DPRINTF will always be compiled, even if it's disabled. If TRACING_ON is false, the if around it will short circuit to false without actually running any code to check the specified condition, and the body of the if will be elided by the compiler as unreachable code. This creates a more consistent environment whether TRACING_ON is on or not, so that variables which are only used in DPRINTF don't have to be guarded by their own TRACING_ON #ifs at the call site. It also ensures that the code inside DPRINTF is always checked to be valid code, even if the DPRINTF itself will never go off. This helps avoid syntax errors, etc, which aren't found because of the configuration of the build being tested with. Change-Id: Ia95ae229ebcd2fc9828f62e87f037f76b9279819 Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/44988 Maintainer: Gabe Black <gabe.black@gmail.com> Tested-by: kokoro <noreply+kokoro@google.com> Reviewed-by: Daniel Carvalho <odanrc@yahoo.com.br>
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.