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Z3-str2 is a string theory plug-in built on the powerful Z3 SMT solver.

Z3-str2 treats strings as a primitive type, thus avoiding the inherent limitations observed in many existing solvers that encode strings in terms of other primitives.

Documentations:

Please refer to https://sites.google.com/site/z3strsolver/

Installation

Linux

  1. Check out the latest version of Z3-str2 from the git repo.

  2. Download the source code of Z3 4.1.1

MD5 SUM: c0c2367e4de05614a80b3f62480c23db z3-src-4.1.1.zip

  1. Unzip "z3-src-4.1.1.zip" and patch the original Z3. Z3-str2 will work with the modified Z3 core. Suppose the folder name after unzipping is "z3".

    • $ cp z3.patch z3/
    • $ cd z3
    • $ patch -p0 < z3.patch

  2. In the top level folder of Z3 Build the modifed version of Z3

    • $ autoconf
    • $ ./configure
    • $ make
    • $ make a

  3. Build Z3-str2

    • Modify variable "Z3_path" in the Z3-str2 Makefile to indicate the patched Z3 location.

      $ make

  4. Setup Z3-str2 driver script

    • In "Z3-str2.py", change the value of the variable "solver" to point to the Z3-str2 binary "str" just built

  5. Run Z3-str2

    • Z3-str2.py -f <inputFile>, e.g

      $./Z3-str2.py -f tests/concat-002

Mac OS

  1. Install "autoconf", "dos2unix", "gcc"

    • $ brew install autoconf
    • $ brew install dos2unix
    • $ brew install gcc --without-multilib

  2. Check out the latest version of Z3-str2 from the git repo.

  3. Download the source code of Z3 4.1.1

MD5 SUM: c0c2367e4de05614a80b3f62480c23db z3-src-4.1.1.zip

  1. Unzip "z3-src-4.1.1.zip" and patch the original Z3. Z3-str2 will work with the modified Z3 core. Suppose the folder name after unzipping is "z3".

    • $ cp z3.patch z3/
    • $ cd z3
    • $ patch -p0 < z3.patch

  2. In the top level folder of Z3 Build the modifed version of Z3

    • $ autoconf
    • $ CXX=g++-5 CC=gcc-5 ./configure
    • $ CXX=g++-5 CC=gcc-5 make
    • $ make a

  3. Build Z3-str2

    • Modify variable "Z3_path" in the Z3-str2 Makefile to indicate the patched Z3 location.

      $ make

  4. Setup Z3-str2 driver script

    • In "Z3-str2.py", change the value of the variable "solver" to point to the Z3-str2 binary "str" just built

  5. Run Z3-str2

    • Z3-str2.py -f <inputFile>, e.g

      $./Z3-str2.py -f tests/concat-002

Cygwin

Assume we are using cygwin version 2.873 (64 bit)

  1. Install cygwin with the following additional packages

    • "autoconf 2.5" in "Devel"
    • "dos2unix" in "Untils"
    • "gcc-g++: GNU Compiler Collectoin" in "Devel"
    • "make: The GNU version of the 'make' utility"
    • "patch" in "Devel"
    • "python: Python language interpreter" in "Python"

  2. Build Z3 without patching

    • Download z3 4.1.1
      http://z3.codeplex.com/downloads/get/500120

    • Untar
      suppose the z3 src folder is "/home/hi/z3/z3"

    • Patch
      $ patch -p0 < z3.patch
      patching file lib/api_user_theory.cpp
      patching file lib/buffer.h
      patching file lib/debug.h
      patching file lib/ref_vector.h
      patching file lib/smt_enode.h
      patching file lib/theory_arith_core.h
      patching file lib/theory_arith.h
      patching file lib/user_smt_theory.cpp
      patching file lib/user_smt_theory.h
      patching file lib/z3_api.h

    • autoconf
      $ autoconf-2.69

    • configure
      $ ./configure
      checking for dos2unix... /usr/bin/dos2unix
      checking for g++... g++
      checking whether the C++ compiler works... yes
      checking for C++ compiler default output file name... a.exe
      checking for suffix of executables... .exe
      checking whether we are cross compiling... no
      checking for suffix of object files... o
      checking whether we are using the GNU C++ compiler... yes
      checking whether g++ accepts -g... yes
      checking whether make sets $(MAKE)... no
      configure: error: Unknown host platform: CYGWIN_NT-6.1

    • modify configure
      host_os=uname -s
      host_os="Linux"

    • make
      It's fine to have warnings like "warning: -fPIC ignored for target (all code is position independent)"

    • make a

  3. Build Z3-str

    • Specify Z3 path in Makefile, e.g
      Z3_path = /home/hi/z3/z3

    • make

    • Specify z3str binary in wrapper "Z3-str.py", e.g
      solver = "/home/hi/z3/str/str.exe"

    • test
      hi@hi-vm ~/z3/str
      $ ./Z3-str.py -f tests/concat-001
      * v-ok
      ************************
      >> SAT
      ------------------------
      y1 : string -> "aaaaaaao"
      y2 : string -> "y"
      x : string -> "teaaaaaaaosty"
      ************************
      >> etime(s) = 0.100061