silicon | based verifier for the Viper intermediate verification | Architecture library
kandi X-RAY | silicon Summary
kandi X-RAY | silicon Summary
Silicon is a state-of-the-art, automated verifier based on symbolic execution, and the default verifier of the Viper verification infrastructure. Silicon's input language is the Viper intermediate verification language: a language in the spirit of Microsoft's Boogie, but with a higher level of abstraction and a built-in notation of permissions, which makes Viper well-suited for encoding and verifying properties of sequential and concurrent programs with shared mutable state. Loads of details can (but don't need to) be found in the PhD thesis of Malte Schwerhoff.
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Currently covering the most popular Java, JavaScript and Python libraries. See a Sample of silicon
silicon Key Features
silicon Examples and Code Snippets
Lines of Code : 87License : Weak Copyleft (MPL-2.0)
Copy#include
#include
#include
struct Cell {
int val;
};
void inc(Cell* c, std::mutex* guard) {
guard->lock();
int t = c->val;
std::this_thread::sleep_for(std::chrono::seconds(1));
c->val = t + 1;
guard->unlock();
}
in Community Discussions
Trending Discussions on silicon
QUESTION
I've upgraded to the M1 chip 2020 Macbook Air from a 7th gen. Intel chip pc. Overall, I'm very happy and content with it but when it comes to Android Studio performance, which I use quite often, it is very disappointing I'm sorry to say. When will an Apple Silicon compatible version be available? Are any of you guys have any clue?
...ANSWER
Answered 2021-Apr-11 at 08:34use Intellij CE the latest version released on April 6th has native support for m1 and its very fast and intuitive, i've been using it and it's not very different from android studio
QUESTION
I'm following JetBrains's tutorial on an Apple Silicon computer. I installed boost with MacPorts (sudo port install boost), the version is 1.71 The build of tests.cpp file fails with the following error:
...ANSWER
Answered 2021-Jan-03 at 12:57Add
QUESTION
I have an app which compiles and runs fine in older Macs with Intel processors in physical devices & iOS simulators.
The same app also compiles and runs fine from newer Apple Silicon Mac with M1 processor with physical iPhone devices, but, it refuse to be compiled for iOS simulator.
Without simulator support, debugging turn around time gets gets really long so I am trying to solve this issue. Not to mention Xcode preview feature isn't working either which is annoying.
The first error that I encountered without making any changes (but moved from Intel Mac to M1 Mac) is like below.
building for iOS Simulator, but linking in dylib built for iOS, file '/Users/andy/workspace/app/Pods/GoogleWebRTC/Frameworks/frameworks/WebRTC.framework/WebRTC' for architecture arm64
The Cocoapods library that I am using is GoogleWebRTC, and according to its doc, arm64 should be supported so I am baffled why above error is getting thrown. As I have said before, it compiles fine in real device which I believe is running on arm64.
According to the doc..
This pod contains the WebRTC iOS SDK in binary form. It is a dynamic library that contains the armv7, arm64 and x86_64 slices. Bitcode is not supported. Our currently provided API’s are Objective C only.
I searched online and it appears there appears to be 2 workarounds for this issue.
- The first one is by adding
arm64toExcluded Architectures - The second option is to mark
Build Active Architecture OnlyforReleasebuild.
I don't exactly understand if above are necessary even when I am compiling my app on M1 Mac which is running under arm64 architecture, because the solution seems to be applicable only for for Intel Mac which does not support arm64 simulator, as for Intel Mac, simulators might have been running in x86_64, not with arm64, so solution #1 is not applicable in my case.
When I adapt the second change only, nothing really changes and the same error is thrown.
When I make both changes and tried building, I now get the following 2nd error during build. (not really 100% sure if I solved the 1st error / I might have introduced 2nd error in addition to 1st by adapting two changes)
Could not find module 'Lottie' for target 'x86_64-apple-ios-simulator'; found: arm64, arm64-apple-ios-simulator
The second library that I am using is lottie-ios and I am pulling this in with a swift package manager. I guess what is happening is that because I excluded arm64 in build setting for iOS simulator, Xcode is attempting to run my app in x86_64. However, library is not supported running in x86_64 for some reason, and is throwing an error. I don't have much insights into what dictates whether or not library can run in x86_64 or arm64 so I couldn't dig to investigate this issue.
My weak conclusion is that GoogleWebRTC cannot be compiled to run in iOS simulator with arm64 for some reason (unlike what its doc says), and lottie-ios cannot be compiled to run in iOS simulator with x86_64. So I cannot use them both in this case.
Q1. I want to know what kind of changes I can make to resolve this issue...
The app compiles and runs perfectly in both device & simulator when compiled from Intel Mac. The app compiles and runs fine in device when compiled from Apple Silicon Mac. It is just that app refuse to be compiled and run in iOS simulator from Apple Silicon Mac, and I cannot seem to figure out why.
Q2. If there is no solution available, I want to understand why this is happening in the first place.
I really wish not to buy old Intel Mac again just to make things work in simulator.
...ANSWER
Answered 2021-Mar-27 at 20:15Answering my own question in a hope to help others who are having similar problems. (and until a good answer is added from another user)
I found out that GoogleWebRTC actually requires its source to be compiled with x64 based on its source depo.
For builds targeting iOS devices, this should be set to either "arm" or "arm64", depending on the architecture of the device. For builds to run in the simulator, this should be set to "x64".
https://webrtc.github.io/webrtc-org/native-code/ios/
This must be why I was getting the following error.
building for iOS Simulator, but linking in dylib built for iOS, file '/Users/andy/workspace/app/Pods/GoogleWebRTC/Frameworks/frameworks/WebRTC.framework/WebRTC' for architecture arm64
Please correct me if I am wrong, but by default, it seems that Xcode running in Apple M1 silicon seems to launch iOS simulator with arm arch type. Since my app did run fine on simulators in Intel Mac, I did the following as a workaround for now.
- Quit Xcode.
- Go to Finder and open Application Folder.
- Right click on Xcode application, select
Get Info - In the "Xcode Info Window" check on
Open using Rosetta. - Open Xcode and try running again.
That was all I needed to do to make my app, which relies on a library that is not yet fully supported on arm simulator, work again. (I believe launching Xcode in Rosetta mode runs simulator in x86 as well..?? which explains why things are working after making the above change)
A lot of online sources (often posted before M1 Mac launch on Nov/2020) talks about "add arm64 to Excluded Architectures", but that solution seems to be only applicable to Intel Mac, and not M1 Mac, as I did not need to make that change to make things work again.
Of course, running Xcode in Rosetta mode is not a permanent solution, and Xcode slows down lil bit, but it is an interim solution that gets things going in case one of libraries that you are using is not runnable in arm64 simulator.. yet.
QUESTION
I was trying to print the square root of a number at some given precision.
...ANSWER
Answered 2021-Jun-07 at 10:51It was able to print over 50 digits of precision? I thought doubles could only handle 17 digits?
It's false precision because you asked for it.
Say I ask someone how tall a building is and they say "oh, about 50 meters". If you ask me to give that to you in feet to five decimal places, I can -- 164.04199 feet. But the precision is false.
Check it out:
Output: 1.414213562373095145474621858738828450441...
Correct: 1.414213562373095048801688724209698078569...
QUESTION
I am injecting an object in a Blazor app as a singleton that is constructed using ILogger;
...ANSWER
Answered 2021-Jun-07 at 08:04The problem is not in ILogger, but in its configuration. Apparently, it uses EventLog, which is used to write logs to Windows Event Log, not available on other platforms.
You most likely have something like that in your logging configuration.
QUESTION
we have developed a kernel extension (KEXT) for a virtual file system (VFS) on macOS to integrate our software with external programs like Adobe InDesign or Microsoft Word. Our software and the KEXT are used by many of our customers.
As it looks like KEXTs are deprecated and may be removed completely in future versions of macOS, particularly on Apple Silicon based computers. See e.g. Apple's announcement in its security guide:
"This is why developers are being strongly encouraged to adopt system extensions before kext support is removed from macOS for future Mac computers with Apple silicon"
Therefore we are currently investigating in possible alternatives.
Apple suggests to migrate to System Extensions instead of KEXTs. However, the only VFS related API we found is to implement a File Provider that is based on an NSFileProviderReplicatedExtension.
Unfortunately that NSFileProviderReplicatedExtension has several flaws:
- Files can either be in the cloud or downloaded. It is not possible to download/read only a portion of a file. This is a big performance problem for us, since we work with large images (> 1GB). The programs we integrate with typically only read a part of the image, e.g. the embedded preview. The API does not offer a way to access selected blocks of a file (random access file).
- The File Provider learns about the file system content via
enumerators. So everything that is inside a folder must be enumerated (listed) first. Otherwise it cannot be accessed. However, we cannot enumerate our VFS. Most of the content of our VFS is fully dynamic. It only exists when it is accessed by a client the first time. Such dynamic content also includes dynamic parameters like the client's locale or the size of a box where the image will be placed. Since we do not know those parameters in advance, we cannot enumerate the VFS's content in advance.
This means, an NSFileProviderReplicatedExtension in its current state isn't a replacement for a "real" VFS and therefore cannot be used by us as a replacement for our current VFS KEXT.
My questions:
- Will Apple allow kernel extensions also in future versions of (Apple Silicon/M1 based) operating systems? Or is there at least a clear deadline?
- If not, what is Apple's officially suggested replacement for KEXT based VFS solutions?
- Will the API of an NSFileProviderReplicatedExtension be improved to behave like a "real" file system so that above mentioned flaws will no longer be an issue?
Many thanks for any answers or comments!
Best regards,
Michael
...ANSWER
Answered 2021-Jun-02 at 11:14Will Apple allow kernel extensions also in future versions of (Apple Silicon/M1 based) operating systems? Or is there at least a clear deadline?
Apple doesn't really give timelines, and they also occasionally break promises of support.
However, this sort of hard API deprecation and removal usually is done as part of a major release, so you will typically get deprecation notice for it at WWDC one year, users might start seeing deprecation notices when the .0 of the OS release ships at the earliest, and sometimes the .3 or .4 revision. Then you'll typically be told at the next WWDC that the API is blocked in the upcoming release, so by that point you should have implemented a replacement.
If not, what is Apple's officially suggested replacement for KEXT based VFS solutions?
As far as I'm aware, NSFileProviderReplicatedExtension is currently the only one.
Will the API of an NSFileProviderReplicatedExtension be improved to behave like a "real" file system so that above mentioned flaws will no longer be an issue?
Other than via beta SDKs, Apple generally doesn't pre-announce future APIs.
My advice:
- File issues for each of the file provider shortcomings you are hitting using Feedback Assistant. (Radar)
- File an "enhancement request" feedback issue with Apple for a "real" file system API replacement for the VFS KPI.
- If your vfs kext is critical to your business/product, I suggest additionally asking Apple's DTS via a TSI what they recommend for your situation. Reference the feedback IDs of the issues filed, otherwise they will recommend that you file issues.
QUESTION
Getting this error while building docker images on Mac OS BigSur with M1 chip.
What I've tried: Installed docker for Apple Silicon Graphic M1 from docker site
It fails while trying to install RocksDB from Docker
...ANSWER
Answered 2021-May-31 at 17:35There are a couple of issues to address. The dockerfile as you have it will download a base golang ARM image, and try to use that to build. That's fine, as long as the required libs "know how" to build with an arm architecture. If they don't know how to build under arm (as seems to be the case here), you may want to try building under an AMD image of golang.
Intel / AMD containers will run under ARM docker on an M1. There are a few ways to build AMD containers on an M1. You can use buildkit, and then:
docker buildx build --platform linux/amd64 .
or, you can add the arch to the source image by modifying the Dockerfile to include something like:
QUESTION
I got my new Macbook Pro which has M1 chip.
I tried to run my react native project but stucked on pod install.
After that, I created an empty project and tried on that still getting the same error.
...ANSWER
Answered 2021-Jan-31 at 18:25I realized that homebrew installation messed up cocoapods.
Simply, I uninstalled homebrew and start from beginning. Then it worked.
QUESTION
I just need a little help finding an element in my python script with Beautiful Soup.
Below is the html:
...ANSWER
Answered 2021-May-26 at 09:46I have taken your data as html so what approach you can follow get the text with in that div and use strip to remove unnecessary data now if you see main_div contain some letters so remove it by using re and you finally get your desired output
QUESTION
I'm using this piece of code to display the range price of variable product from € - €€€ to Starting From €. I'm taking the max price and divide it by 10 because my max variation is a pack of 10.
...ANSWER
Answered 2021-May-20 at 10:26It looks like you're using the ELEX WooCommerce Dynamic Pricing and Discounts Plugin or similar, as eha_variable_sale_price_html is not a standard WooCommerce hook name.
In any case, you should be able to access the global $product object, which you can query to get its id or its product categories. Based on that, you can then build your check to determine whether you need to divide the max price by 10 or not.
For example, a criteria based on the product category would look like this (you will need to adapt the Quantity Product category name to your case):
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
Vulnerabilities
No vulnerabilities reported
Install silicon
Download the Viper IDE (based on Microsoft Visual Studio Code).
Experiment with Viper using the Viper online web interface.
You need recent installations of the sbt build tool the Z3 SMT solver
Clone Silver, e.g. into ~/silver
Clone Silicon (this repository), e.g. into ~/silicon
From within the directory where you installed Silicon, create a symbolic link to the directory where you installed Silver. E.g. there should be a symbolic link from ~/silicon/silver to ~/silver. Alternatively, directly clone Silver into, e.g. ~/silicon/silver.
Open a console, change directory to ~/silicon
Compile by running sbt compile, or run all tests via sbt test
We recommend IDEA IntelliJ for Scala development, but any IDE that supports sbt will do
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