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maehne

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maehne last won the day on July 11

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About maehne

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  1. maehne

    A SystemC installl problem on Ubuntu

    If it is necessary for you to stick with SystemC 2.3.1, you can simply comment out the offending line in systemc.h. The function is nowhere used inside the proof-of-concept implementation of SystemC.
  2. Yes, this change in behaviour of SystemC 2.3.2 with respect to SystemC 2.3.1 is intentional to better conform to IEEE Std 1666-2011, which states in clause 6.4.4 about signal writes under the SC_MANY_WRITERS policy: This fix by @Philipp A Hartmann is documented in the RELEASENOTES of SystemC 2.3.2:
  3. maehne

    make check return fail

    @David Black: Did you yet find the time to attempt to fix the sem_init issue on macOS?
  4. maehne

    Static Analyzer Report of SystemC-2.3.2

    Thanks Sumit for reporting these issues! I have reported them to the Language Working Group so that we can try to fix them in the proof-of-concept implementation. Regards, Torsten
  5. maehne

    How SystemC kernel is implemented !!

    Regarding sc_simcontext, this class is not part of IEEE Std 1666-2011! It is an implementation artefact, which should not concern you as a user. The proof-of-concept implementation uses it for house-keeping and managing the global state of the simulation kernel.
  6. maehne

    How SystemC kernel is implemented !!

    If you are interested in the elaboration and simulation semantics of SystemC, have a look to clause 4 of IEEE Std 1666-2011. The simulation semantics are based on the discrete-event model of computation and employ the concept of delta cycles to achieve determinism of the simulation results. This is very close to other hardware description languages such as VHDL. Using your favourite search engine, you can find additional information such as the following two tutorials: John Moondanos "SystemC Tutorial" Federico Angiolini "SystemC Tutorial" which give a brief summary of these semantics and the core ideas of SystemC. Though, please take into account that both tutorials are 10+ years old, which means that certain aspects have evolved considerably. For a good introduction to SystemC, I suggest that you read a good book on the topic, such as "SystemC from the Ground Up" by David Black et al. To efficiently use SystemC, you have to master the core concepts of C++ first.
  7. maehne

    A SystemC installl problem on Ubuntu

    This issue has been fixed in the SystemC 2.3.2 release available from the Accellera website. The function std::gets was definitely removed in the C'11 standard and deprecated in the C++'11 standard so that recent compilers do not provide it anymore as its semantics constitutes a security risk due to buffer overflows.
  8. I am afraid, this is a question, which only @David Black or one of his co-authors of the book can answer. As far as I can remember, I could never find the advertised online material under the URL mentioned in the book. Nevertheless, I still consider it one of the best books on the topic of SystemC.
  9. maehne

    make check return fail

    Thanks for your analysis David! I have reported this issue to the SystemC Language Working Group.
  10. maehne

    fifo waveform tracing

    You need to be more precise in your problem description! You did not post the exact error message you might have obtained nor is your code example complete and self-contained. Therefore, any answer by us is mostly based on wild guessing. Please note that you will only actually see traces in your VCD files if actually events happened during your simulation. If your sc_module example constitutes your Design Under Verification, you are missing at least in the posted code snippet some stimuli generator, which would trigger any events. I suggest you that you get familiar with C++ and then start with a good introduction tutorial / book on SystemC before pursuing your own modeling attempts.
  11. maehne

    systemc-2.3.2 with C++17

    Hello Sumit, for compiling SystemC using CMake for C++'17, you will have to specify the C++ language standard version through the variable CMAKE_CXX_STANDARD. The value "17" is only supported since CMake 3.8. If you are still using an older version, this might explain your compilation problems. Enable verbose output for your build system to check which flags are effectively passed to your compiler. Passing the C++ standard version via the "-std=c++17" compiler switch ist more fragile when using CMake, as the latter might add conflicting additional flags. Regards, Torsten
  12. Let me be clear: You don't need to provide -DSCV_DISABLE_USING_NAMESPACES during the compilation of the SCV library itself. You only pass -DSCV_DISABLE_USING_NAMESPACES once you compile your application and link it to the SCV library.
  13. Hello Sumit, Do you mean that you specified -DSCV_DISABLE_USING_NAMESPACES explicitly when compiling the SCV library itself? The preprocessor definition SCV_DISABLE_USING_NAMESPACES is only meant for use in user applications, i.e., you need to pass when compiling your own code. See the RELEASENOTES section 2 for details. When we first prepared the SCV 2.0.1release, we didn't want to import the std namespace by default, but it caused too much trouble with existing code bases, which lead to this ugly method to opt out of it.
  14. maehne

    system c beginner

    First, make sure that you are proficient in C++ as SystemC is a C++ library, which makes extensively use of advanced C++ features! Then, read a good introductory book on SystemC. I am personally not familiar with the SystemC Primer so cannot judge it. I found the book "SystemC from the Ground Up" by David C. Black, Jack Donovan et al. very helpful to learn SystemC.
  15. Newer compiler versions usually are accompanied by a newer implementation of the standard library. This newer version might have been optimised to reduce side-effects when including a standard header, i.e., to only include definitions that are mandated by the standard and to reduce as much as possible the inclusion of other headers, which are only needed for the implementation of its functions. Another thing, which might affect you is that newer compilers might use a newer C++ standard by default, e.g., C++'14 or C++'11. SystemC 2.3.2 already contains functions, which make use of C++'11/14 features. If this is not the default C++ version for your compiler, you must make sure that SystemC AMS and your models get compiled with the same compiler flags, i.e., also against the same C++ version. Regarding your simple SystemC AMS example: You will have to provide more information, i.e., a minimum self-contained code example plus the compiler messages so that we may help you.
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