# Copyright 2019 The Fuchsia Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

# TODO(fxbug.dev/54160): Keep in sync with //build/config/zircon/instrumentation/BUILD.gn

import("//build/config/zircon/instrumentation/sanitizer_default_options.gni")

config("asan") {
  compiler_flags = [ "-fsanitize=address" ]
  asmflags = compiler_flags
  cflags = compiler_flags
  ldflags = compiler_flags
  if (is_kernel) {
    configs = [ "//zircon/kernel/lib/instrumentation/asan:kasan" ]
  }
}

sanitizer_default_options("asan_default_options") {
  # The asan runtime includes the lsan and ubsan runtimes, which parse their
  # own options.
  deps = [
    ":lsan_default_options",
    ":ubsan_default_options",
  ]
}

sanitizer_default_options("lsan_default_options") {
}

# TODO(fxbug.dev/45047): Temporary while leaks are plugged.
# As leak bugs are found, file a bug #nnnnn for the leaky test/component,
# and then add:
# ```
#   # TODO(nnnnn): Fix the leaks and remove this.
#   deps += [ "//build/config/zircon/instrumentation:suppress-lsan.DO-NOT-USE-THIS" ]
# ```
# to the target that builds the leaky code.  When all leaky tests have been
# marked that way, the asan_default_options default above will be removed.
sanitizer_extra_options("suppress-lsan.DO-NOT-USE-THIS") {
  visibility = [
    "*",  # TODO(fxbug.dev/45047): constrain this and give each a TODO(nnnnn)
          # comment
  ]

  args = [ "detect_leaks=0" ]
  output_name = "lsan_default_options"
  tags = [ "lsan" ]
}

# TODO(fxbug.dev/59214): Temporary while bugs are fixed.  As stack-use-after-return bugs
# are found, file a bug #nnnnn for the buggy test/component, and then add:
# ```
#   # TODO(nnnnn): Fix the bugs and remove this.
#   deps += [ "//build/config/zircon/instrumentation:suppress-asan-stack-use-after-return" ]
# ```
sanitizer_extra_options("suppress-asan-stack-use-after-return") {
  visibility = [
    # TODO(fxbug.dev/59214): Allow only necessary third-party or TODO(bug-filed) cases.
    # Playbook for suppression is to file bug #nnnnn for specific code
    # reporting a violation, and add it to this visibility list with a comment
    # at the end of the line: `# TODO(nnnnn): remove when fixed`.
  ]

  args = [ "detect_stack_use_after_return=0" ]
  output_name = "asan_default_options"
  tags = [ "asan" ]
}

config("ubsan") {
  compiler_flags = [ "-fsanitize=undefined" ]
  asmflags = compiler_flags
  cflags = compiler_flags
  ldflags = compiler_flags
}

sanitizer_default_options("ubsan_default_options") {
}

# ubsan-trap is pure instrumentation with no runtime.
config("ubsan-trap") {
  if (is_gcc) {
    compiler_flags = [
      "-fsanitize=undefined",
      "-fsanitize-undefined-trap-on-error",
    ]
  } else {
    compiler_flags = [ "-fsanitize-trap=undefined" ]
  }
  asmflags = compiler_flags
  cflags = compiler_flags
  ldflags = compiler_flags
}

# NOTE: Every variant that includes any sancov configs must have "sancov"
# in tags.  See //zircon/system/ulib/c/sanitizers.  To make it harder to fail
# to do this, only define the configs in toolchains with the tag.
if (toolchain.tags + [ "sancov" ] - [ "sancov" ] != toolchain.tags) {
  config("sancov") {
    compiler_flags = [ "-fsanitize-coverage=trace-pc-guard" ]
    asmflags = compiler_flags
    cflags = compiler_flags
    ldflags = compiler_flags
  }

  # This enables all the different kinds of sancov callbacks, not just
  # the basic ones actually implemented by the canonical runtime.
  config("sancov-full") {
    compiler_flags = [ "-fsanitize-coverage=indirect-calls,trace-cmp,trace-div,trace-gep,trace-pc-guard,inline-8bit-counters,pc-table" ]
    asmflags = compiler_flags
    cflags = compiler_flags
    ldflags = compiler_flags
  }

  # fuzzer instrumentation is a superset of the sancov instrumentation.
  config("fuzzer") {
    compiler_flags = [ "-fsanitize=fuzzer" ]
    asmflags = compiler_flags
    cflags = compiler_flags
    ldflags = compiler_flags
  }

  group("fuzzer_deps") {
    if (is_fuchsia) {
      # The statically-linked libFuzzer runtime depends on libfdio and
      # libzircon.
      deps = [
        "//zircon/system/ulib/fdio",
        "//zircon/system/ulib/zircon",
      ]
    }
  }
}

config("profile") {
  compiler_flags = [
    "-fprofile-instr-generate",
    "-fcoverage-mapping",
  ]
  asmflags = compiler_flags
  cflags = compiler_flags
  ldflags = compiler_flags
  defines = [ "LLVM_PROFILE" ]
}

group("profile_deps") {
  if (is_fuchsia && !is_kernel) {
    # The statically-linked profiling runtime depends on libzircon.
    deps = [ "//zircon/system/ulib/zircon" ]
  }
}