Run intTests and s2n proofs in Travis CI. (#607)

* Run intTests and s2n proofs in Travis CI.

Split Travis CI jobs into three stages: `build`, `test`, and `s2n
test`. The `build` stage consists of two jobs, one that builds with
`ghc-8.6.5`, and one that builds with `ghc-8.4.4`, and caches
`dist-newstyle`. The `test` stage runs the LLVM tests in `intTests`
with `ghc-8.6.5`. The `test s2n` stage runs all the `s2n` proofs
with `ghc-8.6.5`.

* Use `cabal new-exec` to find the path of `saw`.

.travis.yml

@@ -1,45 +1,137 @@
-dist: trusty
-sudo: false
-
-language: c
-
-cache:
-  directories:
-  - $HOME/.ghc
-  - $HOME/.cabal
+sudo: required
 
 # Normally, travis tries `git submodule update --init --recursive`, but
 # that fails for us right now due to some submodules from `macaw`. We
 # only really care about one recursive submodule, so we do the update
 # manually in the `script` section.
 git:
   submodules: false
+  depth: 3
 
-matrix:
-  include:
-    - env: CABALVER="2.4" GHCVER="8.6.5"
-      compiler: ": #GHC 8.6.5"
-      addons: {apt: {packages: [cabal-install-2.4,ghc-8.6.5], sources: [hvr-ghc]}}
-    - env: CABALVER="2.4" GHCVER="8.4.4"
-      compiler: ": #GHC 8.4.4"
-      addons: {apt: {packages: [cabal-install-2.4,ghc-8.4.4], sources: [hvr-ghc]}}
-#    - os: osx
-#      env: CABALVER="2.4" GHCVER="8.6.5"
-#      compiler: ": #GHC 8.6.5"
-
-before_install:
-#  - if [[ $TRAVIS_OS_NAME == 'osx' ]];
-#    then
-#        brew update;
-#        brew install ghc;
-#        brew install cabal-install;
-#    fi
-  - unset CC
-  - export PATH=/opt/ghc/bin:$HOME/.cabal/bin:$PATH
+stages:
+  - build
+  - test
+  - test s2n
+
+stage: build
+
+os: linux
+dist: xenial
 
+language: haskell
+cabal: 2.4
+ghc:
+  - 8.6.5
+  - 8.4.4
+
+cache:
+  directories:
+    - $HOME/.ghc
+    - $HOME/.cabal
+    - dist-newstyle
+    - bin
+
+install:
+  - git submodule update --init
+  - (pushd deps/abcBridge && git submodule update --init && popd)
 script:
-  - git submodule init
-  - git submodule update
-  - (cd deps/abcBridge && git submodule init && git submodule update)
-  - cabal v2-update
-  - cabal v2-build -j --disable-optimization
+  - cabal new-update
+  # `libabc.a` is built in by `cabal configure`, not by `cabal build`.
+  # caching `dist-newstyle` means it must be manually built each time
+  - (pushd deps/abcBridge && scripts/build-abc.sh X86_64 Linux --init && popd)
+  - cabal new-build -j saw jss
+  - cp `cabal new-exec --verbose=silent -- sh -c 'which saw'` bin
+  - cp `cabal new-exec --verbose=silent -- sh -c 'which jss'` bin
+
+jobs:
+  include:
+    - stage: test
+      addons:
+        apt:
+          packages:
+            - openjdk-8-jdk
+      before_install:
+        - sudo add-apt-repository -y ppa:sri-csl/formal-methods
+        - sudo apt-get update -q
+        - sudo apt-get install -y yices2
+        - wget -t 3 https://github.com/Z3Prover/z3/releases/download/z3-4.8.7/z3-4.8.7-x64-ubuntu-16.04.zip
+        - unzip z3-4.8.7-x64-ubuntu-16.04.zip
+        - cp z3-4.8.7-x64-ubuntu-16.04/bin/z3 bin
+      script:
+        - cd intTests
+        - for t in test0001 test0019_jss_switch_statement test_crucible_jvm test_ecdsa test_examples test_issue108 test_tutorial1 test_tutorial2 test_tutorial_w4; do echo $t >> disabled_tests.txt; done
+        - BIN=$TRAVIS_BUILD_DIR/bin RT_JAR=/usr/lib/jvm/java-8-openjdk-amd64/jre/lib/rt.jar LOUD=true ./runtests.sh
+        - sh -c "! grep '<failure>' results.xml"
+    # jobs share the cache if they have identical parameters, including
+    # identical environmental variables. In order to share the cache with the
+    # build job, each `s2n` test job exports environment variables manually,
+    # instead of using the `env` key.
+    - &s2n-test-staging
+      stage: test s2n
+      name: hmac md5
+      addons:
+        apt:
+          packages:
+            - clang-3.8
+            - llvm-3.8
+      install:
+        # - git clone https://github.com/awslabs/s2n.git
+        - git clone https://github.com/GaloisInc/s2n.git
+        - mkdir -p s2n/test-deps/saw/bin
+        - cp bin/saw s2n/test-deps/saw/bin
+        - cd s2n
+        - git checkout bump-saw
+      before_script:
+        - export TESTS=sawHMAC
+        - export SAW_HMAC_TEST=md5
+      script:
+        - source .travis/s2n_setup_env.sh
+        - SAW=true travis_retry .travis/s2n_install_test_dependencies.sh
+        - .travis/s2n_travis_build.sh
+    - <<: *s2n-test-staging
+      name: hmac sha1
+      before_script:
+        - export TESTS=sawHMAC
+        - export SAW_HMAC_TEST=sha1
+    - <<: *s2n-test-staging
+      name: hmac sha224
+      before_script:
+        - export TESTS=sawHMAC
+        - export SAW_HMAC_TEST=sha224
+    - <<: *s2n-test-staging
+      name: hmac sha256
+      before_script:
+        - export TESTS=sawHMAC
+        - export SAW_HMAC_TEST=sha256
+    - <<: *s2n-test-staging
+      name: hmac sha384
+      before_script:
+        - export TESTS=sawHMAC
+        - export SAW_HMAC_TEST=sha384
+    - <<: *s2n-test-staging
+      name: hmac sha512
+      before_script:
+        - export TESTS=sawHMAC
+        - export SAW_HMAC_TEST=sha512
+    - <<: *s2n-test-staging
+      name: drbg
+      before_script:
+        - export TESTS=sawDRBG
+    - <<: *s2n-test-staging
+      name: sike
+      before_script:
+        - export TESTS=sawSIKE
+    - <<: *s2n-test-staging
+      name: bike
+      before_script:
+        - export TESTS=sawBIKE
+        - export S2N_LIBCRYPTO=openssl-1.0.2
+    - <<: *s2n-test-staging
+      name: tls
+      before_script:
+        - export TESTS=tls
+    - <<: *s2n-test-staging
+      name: hmac failure
+      before_script:
+        - export TESTS=sawHMACFailure
+