[bazel] Initial support to mjsunit tests

No-Try: true
Bug: v8:11234
Change-Id: I2035107dfc1865ab17a6eb654a9a0967d6cac357
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3080575
Commit-Queue: Victor Gomes <victorgomes@chromium.org>
Auto-Submit: Victor Gomes <victorgomes@chromium.org>
Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#76168}

BUILD.bazel

@@ -6,6 +6,7 @@ load("@bazel_skylib//lib:selects.bzl", "selects")
 load(
     "@v8//:bazel/defs.bzl",
     "v8_binary",
+    "v8_build_config",
     "v8_config",
     "v8_custom_config",
     "v8_raw_flag",
@@ -3058,3 +3059,42 @@ v8_binary(
     ],
     deps = [ ":v8" ],
 )
+
+# =================================================
+# Tests
+# =================================================
+
+v8_build_config(
+    name = "v8_build_config",
+)
+
+# Runs mjunit with d8.
+py_test(
+    name = "mjsunit",
+    size = "medium",
+    srcs = [
+        "test/mjsunit/testcfg.py",
+        "tools/predictable_wrapper.py",
+        "tools/run-tests.py",
+    ] + glob(["tools/testrunner/**/*.py"]),
+    args = [
+        "--no-sorting",
+        "--nopresubmit",
+        # TODO(victorgomes): Create a flag to pass the variant in the cmdline.
+        "--variant=default",
+        "--outdir bazel-bin",
+        "mjsunit",
+    ],
+    data = [
+        ":v8_build_config",
+        ":d8",
+        "test",
+    ] + glob(["test/**"]) + glob(["tools/**/*.js"]) + glob(["tools/**/*.mjs"]),
+    main = "tools/run-tests.py",
+    # TODO(victorgomes): Move this to PY3.
+    python_version = "PY2",
+    tags = [
+        # Disable sanitizers, as they don't work in general in V8.
+        "nosan",
+    ],
+)

bazel/defs.bzl

@@ -237,3 +237,62 @@ v8_mksnapshot = rule(
         ),
     }
 )
+
+def _quote(val):
+    if val[0] == '"' and val[-1] == '"':
+        fail("String", val, "already quoted")
+    return '"' + val + '"'
+
+def _kv_bool_pair(k, v):
+    return _quote(k) + ": " + v
+
+def _json(kv_pairs):
+    content = "{"
+    for (k, v) in kv_pairs[:-1]:
+        content += _kv_bool_pair(k, v) + ", "
+    (k, v) = kv_pairs[-1]
+    content += _kv_bool_pair(k, v)
+    content += "}\n"
+    return content
+
+# TODO(victorgomes): Create a rule (instead of a macro), that can
+# dynamically populate the build config.
+def v8_build_config(name):
+    cpu = _quote("x64")
+    content = _json([
+        ("current_cpu", cpu),
+        ("dcheck_always_on", "false"),
+        ("is_android", "false"),
+        ("is_asan", "false"),
+        ("is_cfi", "false"),
+        ("is_clang", "true"),
+        ("is_component_build", "false"),
+        ("is_debug", "false"),
+        ("is_full_debug", "false"),
+        ("is_gcov_coverage", "false"),
+        ("is_msan", "false"),
+        ("is_tsan", "false"),
+        ("is_ubsan_vptr", "false"),
+        ("target_cpu", cpu),
+        ("v8_current_cpu", cpu),
+        ("v8_enable_atomic_marking_state", "false"),
+        ("v8_enable_atomic_object_field_writes", "false"),
+        ("v8_enable_concurrent_marking", "false"),
+        ("v8_enable_i18n_support", "true"),
+        ("v8_enable_verify_predictable", "false"),
+        ("v8_enable_verify_csa", "false"),
+        ("v8_enable_lite_mode", "false"),
+        ("v8_enable_runtime_call_stats", "false"),
+        ("v8_enable_pointer_compression", "true"),
+        ("v8_enable_pointer_compression_shared_cage", "false"),
+        ("v8_enable_third_party_heap", "false"),
+        ("v8_enable_webassembly", "false"),
+        ("v8_control_flow_integrity", "false"),
+        ("v8_enable_single_generation", "false"),
+        ("v8_target_cpu", cpu),
+    ])
+    native.genrule(
+        name = name,
+        outs = [name + ".json"],
+        cmd = "echo '" + content + "' > \"$@\"",
+    )