Hal Canary 71cf6292db Documentation: more updates to site/dev/testing/xsan.md

No-Try: true
Docs-Preview: https://skia.org/dev/testing/xsan?cl=167393
Change-Id: I5b2a992c762221e45ea3e9dcfb97cc06a86e9bc5
Reviewed-on: https://skia-review.googlesource.com/c/167393
Commit-Queue: Hal Canary <halcanary@google.com>
Reviewed-by: Kevin Lubick <kjlubick@google.com>

2018-11-05 18:23:02 +00:00

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MSAN, ASAN, & TSAN

Testing Skia with memory, address, and thread santizers.

Compiling Skia with ASAN, UBSAN, or TSAN can be done with the latest version of Clang.

UBSAN works on Linux, Mac, Android, and Windows, though some checks are platform-specific.
ASAN works on Linux, Mac, Android.
TSAN works on Linux and Mac.
MSAN works on Linux[1].

We find that testing sanitizer builds with libc++ uncovers more issues than with the system-provided C++ standard library, which is usually libstdc++. libc++ proactively hooks into sanitizers to help their analyses. We ship a copy of libc++ with our Linux toolchain in /lib.

[1]To compile and run with MSAN, an MSAN-instrumented version of libc++ is needed. It's generally easiest to run one of the following 2 steps to build/download a recent version of Clang and the instrumented libc++, located in /msan.

Downloading Clang binaries (Googlers Only)

This requires gsutil, part of the gcloud sdk.

CLANGDIR="${HOME}/clang"
python infra/bots/assets/clang_linux/download.py -t $CLANGDIR

Building Clang binaries from scratch (Other users)

CLANGDIR="${HOME}/clang"

python tools/git-sync-deps
CC= CXX= infra/bots/assets/clang_linux/create.py -t "$CLANGDIR"

Configure and Compile Skia with MSAN

CLANGDIR="${HOME}/clang"
mkdir -p out/msan
cat > out/msan/args.gn <<- EOF
    cc = "${CLANGDIR}/bin/clang"
    cxx = "${CLANGDIR}/bin/clang++"
    extra_cflags = [ "-B${CLANGDIR}/bin" ]
    extra_ldflags = [
        "-B${CLANGDIR}/bin",
        "-fuse-ld=lld",
        "-L${CLANGDIR}/msan",
        "-Wl,-rpath,${CLANGDIR}/msan" ]
    sanitize = "MSAN"
    skia_use_fontconfig = false
EOF
python tools/git-sync-deps
bin/gn gen out/msan
ninja -C out/msan

Configure and Compile Skia with ASAN

CLANGDIR="${HOME}/clang"
mkdir -p out/asan
cat > out/asan/args.gn <<- EOF
    cc = "${CLANGDIR}/bin/clang"
    cxx = "${CLANGDIR}/bin/clang++"
    sanitize = "ASAN"
    extra_ldflags = [ "-fuse-ld=lld", "-Wl,-rpath,${CLANGDIR}/lib" ]
EOF
python tools/git-sync-deps
bin/gn gen out/asan
ninja -C out/asan

Configure and Compile Skia with TSAN

CLANGDIR="${HOME}/clang"
mkdir -p out/tsan
cat > out/tsan/args.gn <<- EOF
    cc = "${CLANGDIR}/bin/clang"
    cxx = "${CLANGDIR}/bin/clang++"
    sanitize = "TSAN"
    is_debug = false
    extra_ldflags = [ "-Wl,-rpath,${CLANGDIR}/lib" ]
EOF
python tools/git-sync-deps
bin/gn gen out/tsan
ninja -C out/tsan

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