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uclid5 Tutorial/Publication

The tutorial has a gentle introduction to using uclid5.

If you use uclid5 in your work, please cite the following MEMOCODE 2018 paper:

Sanjit A. Seshia and Pramod Subramanyan. UCLID5: Integrating Modeling, Verification, Synthesis and Learning. [PDF]
Proceedings of the 16th ACM-IEEE International Conference on Formal Methods and Models for System Design. (MEMOCODE 2018). Beijing, China. October 2018.


There are currently two ways to install UCLID5: downloading the latest pre-build package and building from source. Please make sure you have all the pre-requisites before proceeding to installation. Due to the nuances in the later Mac OS versions, we prepare separately a compact list of the installation instructions here.


1. Z3 version 4.8.8.

You will need the Z3 SMT solver to be installed on your system. Earlier versions of Z3 should work, but the CI is tested with version 4.8.8. uclid5 requires that the Z3 dynamic link library ( on Unix-like platforms) as well as the dynamic link library for the Z3/Java API ( on Unix-like platforms) be in your dynamic library path ($LD_LIBRARY_PATH on Unix-like platforms; just PATH on Windows). If compiling from source, the source repository provides an easy way to set up Z3. See the instructions for compiling from source for details.

If you prefer to build Z3 from source, make sure the Z3/Java interface is enabled in your build (typically by passing --java to the script). To install z3 on Unix-like systems from source, download the source code and run the following:

python scripts/ --java
cd build
sudo make install

Finally copy the jar file path/to/z3/build/ to the dir path/to/uclid5/lib/

If you are using Mac OS X El Capitan or above, System Integrity Protection is a feature introduced by Apple in OS X El Capitan; it prevents the modifications of system-owned files and directories by any process without a specific ‘entitlement’, even when executed by a root user or a user with root privileges. Since Java is a SIP protected executable, it ignores the user set DYLD_LIBRARY_PATH, which prevents the system from recognizing the Z3 Dynamic Library.

To fix this issue, put:

  • JNI dynamic link libraries (e.g libz3java.dylib) in: /Library/Java/Extensions
  • non-JNI dynamic link libraries (e.g libz3.dylib) in: /usr/local/lib

For more information on the resolution of this issue, please refer to:

2. OpenJDK version 8 or Oracle JDK version 8

If you are using Mac OS X Mojave or above, we recommend using Java 11 or earlier. We have found some issues related to the System Integrity Protection when using Catalina or Mojave and later versions of OpenJDK.

Download Pre-Built Binaries

Download the latest stable pre-built package from releases tab.

Building From Source

Or, you could clone this repository and build from source. If you run into problems here, don't forget you can always fall back on the pre-built binaries linked above.


In addition to the prerequisites mentioned above, please also note the following if compiling from source:

1. Z3 Setup Script

The script in the source repository makes it easy to set up Z3 for use with uclid5. To use the script, simply run source from the root directory of the uclid5 source repository. This script will download Z3 binaries from GitHub and set up your PATH and LD_LIBRARY_PATH accordingly (it uses to do the latter). You will need to rerun (or the commands in it) each time you open a new bash shell, or you can simply source it from your .profile or .bashrc.

2. SBT version 1.0 or greater.

If you intend to build from source, you need to install sbt. You can skip this step if you are using the pre-build binaries. Install instructions for sbt are available at

Compiling uclid5

If all goes well, running update, clean, compile and test in sbt from the uclid5 directory should do the trick. The command to do all this is:

$ sbt update clean compile "set fork:=true" test

If compilation and tests pass, you can build a universal package.

$ sbt universal:packageBin

This will create uclid/target/universal/, which contains the uclid binary in the bin/ subdirectory. Unzip this file, and add it to your path.

Installing and Running uclid5

$ unzip
$ cd uclid-0.9.5
$ export PATH=$PATH:$PWD/bin

Now you can run uclid using the 'uclid' command. For example:

$ uclid examples/tutorial/ex1.1-fib-model.ucl

Directory Structure

This repository consists of the following sub-directories.

  • examples : This contains example uclid5 models. See examples/tutorial for the examples from the tutorial.
  • lib: Libraries on which uclid5 depends (Z3).
  • project: Build scripts.
  • src/main/scala: uclid5 source.
  • src/test/scala: uclid5 test suite.
  • test: test programs for uclid5.
  • tutorial: uclid5 tutorial (with LaTeX source)
  • vim: vim syntax highlighting for uclid5.

Related Tools

  • chiselucl allows Chisel models to be converted into UCLID5.


UCLID5: formal modeling, verification, and synthesis of computational systems




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