From patchwork Tue Oct 23 23:57:45 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Brendan Higgins X-Patchwork-Id: 10653967 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 83A7413A9 for ; Wed, 24 Oct 2018 00:00:04 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 6BEC62A0CF for ; Wed, 24 Oct 2018 00:00:04 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 5F1A52A431; Wed, 24 Oct 2018 00:00:04 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.7 required=2.0 tests=BAYES_00,DKIM_ADSP_CUSTOM_MED, DKIM_INVALID,DKIM_SIGNED,MAILING_LIST_MULTI,RCVD_IN_DNSWL_NONE autolearn=ham version=3.3.1 Received: from ml01.01.org (ml01.01.org [198.145.21.10]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 391702A3B5 for ; Wed, 24 Oct 2018 00:00:03 +0000 (UTC) Received: from [127.0.0.1] (localhost [IPv6:::1]) by ml01.01.org (Postfix) with ESMTP id 2FCF62117D765; Tue, 23 Oct 2018 17:00:03 -0700 (PDT) X-Original-To: linux-nvdimm@lists.01.org Delivered-To: linux-nvdimm@lists.01.org Received-SPF: Pass (sender SPF authorized) identity=mailfrom; client-ip=2607:f8b0:4864:20::849; helo=mail-qt1-x849.google.com; envelope-from=3albpww4kdi8uax6wt601zz16bz77z4x.v75416dg-6ew15541bcb.jk.7az@flex--brendanhiggins.bounces.google.com; receiver=linux-nvdimm@lists.01.org Received: from mail-qt1-x849.google.com (mail-qt1-x849.google.com [IPv6:2607:f8b0:4864:20::849]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ml01.01.org (Postfix) with ESMTPS id 3462F2117D75F for ; Tue, 23 Oct 2018 17:00:01 -0700 (PDT) Received: by mail-qt1-x849.google.com with SMTP id d6-v6so3770238qtp.21 for ; Tue, 23 Oct 2018 17:00:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=w4FI2FkH6po0aULuzks05V8CQBBPxOjRjgbdeqIEw4g=; b=lZyrjtmuaHC5MTZJsNkGcIrbWpXTKdHBlBtfeqtQ22WGrMumKgX+i8/Jmuq97p+QZi HsjemmOlAVtKhKy9jxg++biKBay2Kus5bmhQk2ia1qzsfsgzVRuLUgvEybUHGwmRdksq VbnqhZPvJljqJnyP9H+PEJwcXHzQgC3YGHopvczKjOtPayXiEfP2yMw4YzDZO3udjDto MB8HdZ8FSGRM5DqZToh8GGUciIeUJrMM454j+jbtf5tb/HRSEHHA+qIKms8u+ogtYRo6 vdFxaD3siGm5Tfinpks4GBDmbufSk+q69cMVFwqvjn9N9hUYfLvBv0khPShNzNz7WGEC sx7w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=w4FI2FkH6po0aULuzks05V8CQBBPxOjRjgbdeqIEw4g=; b=JvpHbpy+SsxF65egd6p59BprCpH8GFeH2TRl2JIwVmkZ7sByd4dfLKBI1BCeBFZkHr WTHtrhqlI2idLvZy24Yai7UJ3M7eWCxzQShi4PpSLViIdQObq79/xKSMuM7GUbQqf9Ew lIRt/ROYYU/R8TdjihqIPzIPuBXO4rvDLxxKDNPoL3bj2FyxcxGbcXprOSRjT/io2zKy 7jNhpph6NOKl+pEoqpVC1tLnQr6eTdJyNWnaZP4SUwzqZWewqfSGpYtnLGzaACNyHxWe 2SAqHgaZTPo0+j1E2+BlRqQzWQa+SUxhJjfpX31ftqnfWJ91g3hfMfgAID99ZabxorzG 7U0w== X-Gm-Message-State: AGRZ1gK+7qtKoYAUVmsPvQ01NW2hor9zg6PChaeliUTQpjx/jG7I7s3H ki3N16/DxhLL237ZvSFcJFM6WlZEQf/KSX2I4hCJjA== X-Google-Smtp-Source: AJdET5cu6UsEX9AyxBQ9NrFTTp3vYWpEfreN/gtWfY2UC8FCc9tVVVAjP3yLT05IpOarjeVHbubxMErnNjBVHC9yu5cWqQ== X-Received: by 2002:ac8:2373:: with SMTP id b48-v6mr306151qtb.43.1540339200228; Tue, 23 Oct 2018 17:00:00 -0700 (PDT) Date: Tue, 23 Oct 2018 16:57:45 -0700 In-Reply-To: <20181023235750.103146-1-brendanhiggins@google.com> Message-Id: <20181023235750.103146-10-brendanhiggins@google.com> Mime-Version: 1.0 References: <20181023235750.103146-1-brendanhiggins@google.com> X-Mailer: git-send-email 2.19.1.568.g152ad8e336-goog Subject: [RFC v2 09/14] kunit: test: add the concept of assertions From: Brendan Higgins To: gregkh@linuxfoundation.org, keescook@google.com, mcgrof@kernel.org, shuah@kernel.org X-BeenThere: linux-nvdimm@lists.01.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Linux-nvdimm developer list." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: brakmo@fb.com, robh@kernel.org, richard@nod.at, dri-devel@lists.freedesktop.org, linux-nvdimm@lists.01.org, mpe@ellerman.id.au, Tim.Bird@sony.com, linux-um@lists.infradead.org, linux-kernel@vger.kernel.org, rostedt@goodmis.org, kieran.bingham@ideasonboard.com, julia.lawall@lip6.fr, joel@jms.id.au, linux-kselftest@vger.kernel.org, khilman@baylibre.com, joe@perches.com, daniel@ffwll.ch, jdike@addtoit.com, Brendan Higgins , kunit-dev@googlegroups.com Errors-To: linux-nvdimm-bounces@lists.01.org Sender: "Linux-nvdimm" X-Virus-Scanned: ClamAV using ClamSMTP Add support for assertions which are like expectations except the test terminates if the assertion is not satisfied. Signed-off-by: Brendan Higgins --- include/kunit/test.h | 272 ++++++++++++++++++++++++++++++++++++- kunit/Makefile | 2 +- kunit/string-stream-test.c | 12 +- kunit/test-test.c | 37 +++++ kunit/test.c | 131 ++++++++++++++++-- 5 files changed, 436 insertions(+), 18 deletions(-) create mode 100644 kunit/test-test.c diff --git a/include/kunit/test.h b/include/kunit/test.h index d652825d7296f..49a9d6e43992c 100644 --- a/include/kunit/test.h +++ b/include/kunit/test.h @@ -84,9 +84,10 @@ struct test; * @name: the name of the test case. * * A test case is a function with the signature, ``void (*)(struct test *)`` - * that makes expectations (see TEST_EXPECT_TRUE()) about code under test. Each - * test case is associated with a &struct test_module and will be run after the - * module's init function and followed by the module's exit function. + * that makes expectations and assertions (see TEST_EXPECT_TRUE() and + * TEST_ASSERT_TRUE()) about code under test. Each test case is associated with + * a &struct test_module and will be run after the module's init function and + * followed by the module's exit function. * * A test case should be static and should only be created with the TEST_CASE() * macro; additionally, every array of test cases should be terminated with an @@ -168,11 +169,14 @@ struct test { const char *name; /* Read only after initialization! */ spinlock_t lock; /* Gaurds all mutable test state. */ bool success; /* Protected by lock. */ + bool death_test; /* Protected by lock. */ struct list_head resources; /* Protected by lock. */ + void (*set_death_test)(struct test *test, bool death_test); void (*vprintk)(const struct test *test, const char *level, struct va_format *vaf); void (*fail)(struct test *test, struct test_stream *stream); + void (*abort)(struct test *test); }; int test_init_test(struct test *test, const char *name); @@ -532,4 +536,266 @@ static inline void test_expect_binary(struct test *test, TEST_EXPECT_END(test, !IS_ERR_OR_NULL(__ptr), __stream); \ } while (0) +static inline struct test_stream *test_assert_start(struct test *test, + const char *file, + const char *line) +{ + struct test_stream *stream = test_new_stream(test); + + stream->add(stream, "ASSERTION FAILED at %s:%s\n\t", file, line); + + return stream; +} + +static inline void test_assert_end(struct test *test, + bool success, + struct test_stream *stream) +{ + if (!success) { + test->fail(test, stream); + test->abort(test); + } else { + stream->clear(stream); + } +} + +#define TEST_ASSERT_START(test) \ + test_assert_start(test, __FILE__, __stringify(__LINE__)) + +#define TEST_ASSERT_END(test, success, stream) \ + test_assert_end(test, success, stream) + +#define TEST_ASSERT(test, success, message) do { \ + struct test_stream *__stream = TEST_ASSERT_START(test); \ + \ + __stream->add(__stream, message); \ + TEST_ASSERT_END(test, success, __stream); \ +} while (0) + +#define TEST_ASSERT_FAILURE(test, message) TEST_ASSERT(test, false, message) + +/** + * TEST_ASSERT_TRUE() - Causes an assertion failure when expression is not true. + * @test: The test context object. + * @condition: an arbitrary boolean expression. The test fails and aborts when + * this does not evaluate to true. + * + * This and assertions of the form `TEST_ASSERT_*` will cause the test case to + * fail *and immediately abort* when the specified condition is not met. Unlike + * an expectation failure, it will prevent the test case from continuing to run; + * this is otherwise known as an *assertion failure*. + */ +#define TEST_ASSERT_TRUE(test, condition) \ + TEST_ASSERT(test, (condition), \ + "Asserted " #condition " is true, but is false.") + +/** + * TEST_ASSERT_FALSE() - Sets an assertion that @condition is false. + * @test: The test context object. + * @condition: an arbitrary boolean expression. + * + * Sets an assertion that the value that @condition evaluates to is false. This + * is the same as TEST_EXPECT_FALSE(), except it causes an assertion failure + * (see TEST_ASSERT_TRUE()) when the assertion is not met. + */ +#define TEST_ASSERT_FALSE(test, condition) \ + TEST_ASSERT(test, !(condition), \ + "Asserted " #condition " is false, but is true.") + +static inline void test_assert_binary(struct test *test, + long long left, const char *left_name, + long long right, const char *right_name, + bool compare_result, + const char *compare_name, + const char *file, + const char *line) +{ + struct test_stream *stream = test_assert_start(test, file, line); + + stream->add(stream, + "Asserted %s %s %s, but\n", + left_name, compare_name, right_name); + stream->add(stream, "\t\t%s == %lld\n", left_name, left); + stream->add(stream, "\t\t%s == %lld", right_name, right); + + test_assert_end(test, compare_result, stream); +} + +/* + * A factory macro for defining the expectations for the basic comparisons + * defined for the built in types. + * + * Unfortunately, there is no common type that all types can be promoted to for + * which all the binary operators behave the same way as for the actual types + * (for example, there is no type that long long and unsigned long long can + * both be cast to where the comparison result is preserved for all values). So + * the best we can do is do the comparison in the original types and then coerce + * everything to long long for printing; this way, the comparison behaves + * correctly and the printed out value usually makes sense without + * interpretation, but can always be interpretted to figure out the actual + * value. + */ +#define TEST_ASSERT_BINARY(test, left, condition, right) do { \ + typeof(left) __left = (left); \ + typeof(right) __right = (right); \ + test_assert_binary(test, \ + (long long) __left, #left, \ + (long long) __right, #right, \ + __left condition __right, #condition, \ + __FILE__, __stringify(__LINE__)); \ +} while (0) + +/** + * TEST_ASSERT_EQ() - Sets an assertion that @left and @right are equal. + * @test: The test context object. + * @left: an arbitrary expression that evaluates to a primitive C type. + * @right: an arbitrary expression that evaluates to a primitive C type. + * + * Sets an assertion that the values that @left and @right evaluate to are + * equal. This is the same as TEST_EXPECT_EQ(), except it causes an assertion + * failure (see TEST_ASSERT_TRUE()) when the assertion is not met. + */ +#define TEST_ASSERT_EQ(test, left, right) \ + TEST_ASSERT_BINARY(test, left, ==, right) + +/** + * TEST_ASSERT_NE() - An assertion that @left and @right are not equal. + * @test: The test context object. + * @left: an arbitrary expression that evaluates to a primitive C type. + * @right: an arbitrary expression that evaluates to a primitive C type. + * + * Sets an assertion that the values that @left and @right evaluate to are not + * equal. This is the same as TEST_EXPECT_NE(), except it causes an assertion + * failure (see TEST_ASSERT_TRUE()) when the assertion is not met. + */ +#define TEST_ASSERT_NE(test, left, right) \ + TEST_ASSERT_BINARY(test, left, !=, right) + +/** + * TEST_ASSERT_LT() - An assertion that @left is less than @right. + * @test: The test context object. + * @left: an arbitrary expression that evaluates to a primitive C type. + * @right: an arbitrary expression that evaluates to a primitive C type. + * + * Sets an assertion that the value that @left evaluates to is less than the + * value that @right evaluates to. This is the same as TEST_EXPECT_LT(), except + * it causes an assertion failure (see TEST_ASSERT_TRUE()) when the assertion is + * not met. + */ +#define TEST_ASSERT_LT(test, left, right) \ + TEST_ASSERT_BINARY(test, left, <, right) + +/** + * TEST_ASSERT_LE() - An assertion that @left is less than or equal to @right. + * @test: The test context object. + * @left: an arbitrary expression that evaluates to a primitive C type. + * @right: an arbitrary expression that evaluates to a primitive C type. + * + * Sets an assertion that the value that @left evaluates to is less than or + * equal to the value that @right evaluates to. This is the same as + * TEST_EXPECT_LE(), except it causes an assertion failure (see + * TEST_ASSERT_TRUE()) when the assertion is not met. + */ +#define TEST_ASSERT_LE(test, left, right) \ + TEST_ASSERT_BINARY(test, left, <=, right) + +/** + * TEST_ASSERT_GT() - An assertion that @left is greater than @right. + * @test: The test context object. + * @left: an arbitrary expression that evaluates to a primitive C type. + * @right: an arbitrary expression that evaluates to a primitive C type. + * + * Sets an assertion that the value that @left evaluates to is greater than the + * value that @right evaluates to. This is the same as TEST_EXPECT_GT(), except + * it causes an assertion failure (see TEST_ASSERT_TRUE()) when the assertion is + * not met. + */ +#define TEST_ASSERT_GT(test, left, right) \ + TEST_ASSERT_BINARY(test, left, >, right) + +/** + * TEST_ASSERT_GE() - Assertion that @left is greater than or equal to @right. + * @test: The test context object. + * @left: an arbitrary expression that evaluates to a primitive C type. + * @right: an arbitrary expression that evaluates to a primitive C type. + * + * Sets an assertion that the value that @left evaluates to is greater than the + * value that @right evaluates to. This is the same as TEST_EXPECT_GE(), except + * it causes an assertion failure (see TEST_ASSERT_TRUE()) when the assertion is + * not met. + */ +#define TEST_ASSERT_GE(test, left, right) \ + TEST_ASSERT_BINARY(test, left, >=, right) + +/** + * TEST_ASSERT_STREQ() - An assertion that strings @left and @right are equal. + * @test: The test context object. + * @left: an arbitrary expression that evaluates to a null terminated string. + * @right: an arbitrary expression that evaluates to a null terminated string. + * + * Sets an assertion that the values that @left and @right evaluate to are + * equal. This is the same as TEST_EXPECT_STREQ(), except it causes an + * assertion failure (see TEST_ASSERT_TRUE()) when the assertion is not met. + */ +#define TEST_ASSERT_STREQ(test, left, right) do { \ + struct test_stream *__stream = TEST_ASSERT_START(test); \ + typeof(left) __left = (left); \ + typeof(right) __right = (right); \ + \ + __stream->add(__stream, "Asserted " #left " == " #right ", but\n"); \ + __stream->add(__stream, "\t\t%s == %s\n", #left, __left); \ + __stream->add(__stream, "\t\t%s == %s\n", #right, __right); \ + \ + TEST_ASSERT_END(test, !strcmp(left, right), __stream); \ +} while (0) + +/** + * TEST_ASSERT_NOT_ERR_OR_NULL() - Assertion that @ptr is not null and not err. + * @test: The test context object. + * @ptr: an arbitrary pointer. + * + * Sets an assertion that the value that @ptr evaluates to is not null and not + * an errno stored in a pointer. This is the same as + * TEST_EXPECT_NOT_ERR_OR_NULL(), except it causes an assertion failure (see + * TEST_ASSERT_TRUE()) when the assertion is not met. + */ +#define TEST_ASSERT_NOT_ERR_OR_NULL(test, ptr) do { \ + struct test_stream *__stream = TEST_ASSERT_START(test); \ + typeof(ptr) __ptr = (ptr); \ + \ + if (!__ptr) \ + __stream->add(__stream, \ + "Asserted " #ptr " is not null, but is."); \ + if (IS_ERR(__ptr)) \ + __stream->add(__stream, \ + "Asserted " #ptr " is not error, but is: %ld", \ + PTR_ERR(__ptr)); \ + \ + TEST_ASSERT_END(test, !IS_ERR_OR_NULL(__ptr), __stream); \ +} while (0) + +/** + * TEST_ASSERT_SIGSEGV() - An assertion that @expr will cause a segfault. + * @test: The test context object. + * @expr: an arbitrary block of code. + * + * Sets an assertion that @expr, when evaluated, will cause a segfault. + * Currently this assertion is only really useful for testing the KUnit + * framework, as a segmentation fault in normal kernel code is always incorrect. + * However, the plan is to replace this assertion with an arbitrary death + * assertion similar to + * https://github.com/google/googletest/blob/master/googletest/docs/advanced.md#death-tests + * which will probably be massaged to make sense in the context of the kernel + * (maybe assert that a panic occurred, or that BUG() was called). + * + * NOTE: no code after this assertion will ever be executed. + */ +#define TEST_ASSERT_SIGSEGV(test, expr) do { \ + test->set_death_test(test, true); \ + expr; \ + test->set_death_test(test, false); \ + TEST_ASSERT_FAILURE(test, \ + "Asserted that " #expr " would cause death, but did not.");\ +} while (0) + #endif /* _KUNIT_TEST_H */ diff --git a/kunit/Makefile b/kunit/Makefile index b437bd546ab70..919fa6faf9940 100644 --- a/kunit/Makefile +++ b/kunit/Makefile @@ -1,3 +1,3 @@ obj-$(CONFIG_KUNIT) += test.o string-stream.o test-stream.o -obj-$(CONFIG_KUNIT_TEST) += string-stream-test.o +obj-$(CONFIG_KUNIT_TEST) += test-test.o string-stream-test.o obj-$(CONFIG_KUNIT_EXAMPLE_TEST) += example-test.o diff --git a/kunit/string-stream-test.c b/kunit/string-stream-test.c index 07c626cbfffbf..5947fada67d96 100644 --- a/kunit/string-stream-test.c +++ b/kunit/string-stream-test.c @@ -19,7 +19,7 @@ static void string_stream_test_get_string(struct test *test) stream->add(stream, " %s", "bar"); output = stream->get_string(stream); - TEST_EXPECT_STREQ(test, output, "Foo bar"); + TEST_ASSERT_STREQ(test, output, "Foo bar"); kfree(output); destroy_string_stream(stream); } @@ -34,16 +34,16 @@ static void string_stream_test_add_and_clear(struct test *test) stream->add(stream, "A"); output = stream->get_string(stream); - TEST_EXPECT_STREQ(test, output, "AAAAAAAAAA"); - TEST_EXPECT_EQ(test, stream->length, 10); - TEST_EXPECT_FALSE(test, stream->is_empty(stream)); + TEST_ASSERT_STREQ(test, output, "AAAAAAAAAA"); + TEST_ASSERT_EQ(test, stream->length, 10); + TEST_ASSERT_FALSE(test, stream->is_empty(stream)); kfree(output); stream->clear(stream); output = stream->get_string(stream); - TEST_EXPECT_STREQ(test, output, ""); - TEST_EXPECT_TRUE(test, stream->is_empty(stream)); + TEST_ASSERT_STREQ(test, output, ""); + TEST_ASSERT_TRUE(test, stream->is_empty(stream)); destroy_string_stream(stream); } diff --git a/kunit/test-test.c b/kunit/test-test.c new file mode 100644 index 0000000000000..fd4b90208f0c3 --- /dev/null +++ b/kunit/test-test.c @@ -0,0 +1,37 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * KUnit test for core test infrastructure. + * + * Copyright (C) 2018, Google LLC. + * Author: Brendan Higgins + */ +#include + +static void test_test_catches_segfault(struct test *test) +{ + void (*invalid_func)(void) = (void (*)(void)) SIZE_MAX; + + TEST_ASSERT_SIGSEGV(test, invalid_func()); +} + +static int test_test_init(struct test *test) +{ + return 0; +} + +static void test_test_exit(struct test *test) +{ +} + +static struct test_case test_test_cases[] = { + TEST_CASE(test_test_catches_segfault), + {}, +}; + +static struct test_module test_test_module = { + .name = "test-test", + .init = test_test_init, + .exit = test_test_exit, + .test_cases = test_test_cases, +}; +module_test(test_test_module); diff --git a/kunit/test.c b/kunit/test.c index f798183533c8d..f89cfaaf5eb79 100644 --- a/kunit/test.c +++ b/kunit/test.c @@ -32,6 +32,27 @@ static void test_set_success(struct test *test, bool success) spin_unlock_irqrestore(&test->lock, flags); } +static bool test_get_death_test(struct test *test) +{ + unsigned long flags; + bool death_test; + + spin_lock_irqsave(&test->lock, flags); + death_test = test->death_test; + spin_unlock_irqrestore(&test->lock, flags); + + return death_test; +} + +static void test_set_death_test(struct test *test, bool death_test) +{ + unsigned long flags; + + spin_lock_irqsave(&test->lock, flags); + test->death_test = death_test; + spin_unlock_irqrestore(&test->lock, flags); +} + static int test_vprintk_emit(const struct test *test, int level, const char *fmt, @@ -70,13 +91,34 @@ static void test_fail(struct test *test, struct test_stream *stream) stream->commit(stream); } +static void __noreturn test_abort(struct test *test) +{ + test_set_death_test(test, true); + if (current->thread.fault_catcher && current->thread.is_running_test) + UML_LONGJMP(current->thread.fault_catcher, 1); + + /* + * Attempted to abort from a not properly initialized test context. + */ + test_err(test, + "Attempted to abort from a not properly initialized test context!"); + if (!current->thread.fault_catcher) + test_err(test, "No fault_catcher present!"); + if (!current->thread.is_running_test) + test_err(test, "is_running_test not set!"); + show_stack(NULL, NULL); + BUG(); +} + int test_init_test(struct test *test, const char *name) { spin_lock_init(&test->lock); INIT_LIST_HEAD(&test->resources); test->name = name; + test->set_death_test = test_set_death_test; test->vprintk = test_vprintk; test->fail = test_fail; + test->abort = test_abort; return 0; } @@ -122,16 +164,89 @@ static void test_run_case_cleanup(struct test *test, } /* - * Performs all logic to run a test case. + * Handles an unexpected crash in a test case. */ -static bool test_run_case(struct test *test, - struct test_module *module, - struct test_case *test_case) +static void test_handle_test_crash(struct test *test, + struct test_module *module, + struct test_case *test_case) { - test_set_success(test, true); + test_err(test, "%s crashed", test_case->name); + /* + * TODO(brendanhiggins@google.com): This prints the stack trace up + * through this frame, not up to the frame that caused the crash. + */ + show_stack(NULL, NULL); + + test_case_internal_cleanup(test); +} - test_run_case_internal(test, module, test_case); - test_run_case_cleanup(test, module, test_case); +/* + * Performs all logic to run a test case. It also catches most errors that + * occurs in a test case and reports them as failures. + * + * XXX: THIS DOES NOT FOLLOW NORMAL CONTROL FLOW. READ CAREFULLY!!! + */ +static bool test_run_case_catch_errors(struct test *test, + struct test_module *module, + struct test_case *test_case) +{ + jmp_buf fault_catcher; + int faulted; + + test_set_success(test, true); + test_set_death_test(test, false); + + /* + * Tell the trap subsystem that we want to catch any segfaults that + * occur. + */ + current->thread.is_running_test = true; + current->thread.fault_catcher = &fault_catcher; + + /* + * ENTER HANDLER: If a failure occurs, we enter here. + */ + faulted = UML_SETJMP(&fault_catcher); + if (faulted == 0) { + /* + * NORMAL CASE: we have not run test_run_case_internal yet. + * + * test_run_case_internal may encounter a fatal error; if it + * does, we will jump to ENTER_HANDLER above instead of + * continuing normal control flow. + */ + test_run_case_internal(test, module, test_case); + /* + * This line may never be reached. + */ + test_run_case_cleanup(test, module, test_case); + } else if (test_get_death_test(test)) { + /* + * EXPECTED DEATH: test_run_case_internal encountered + * anticipated fatal error. Everything should be in a safe + * state. + */ + test_run_case_cleanup(test, module, test_case); + } else { + /* + * UNEXPECTED DEATH: test_run_case_internal encountered an + * unanticipated fatal error. We have no idea what the state of + * the test case is in. + */ + test_handle_test_crash(test, module, test_case); + test_set_success(test, false); + } + /* + * EXIT HANDLER: test case has been run and all possible errors have + * been handled. + */ + + /* + * Tell the trap subsystem that we no longer want to catch any + * segfaults. + */ + current->thread.fault_catcher = NULL; + current->thread.is_running_test = false; return test_get_success(test); } @@ -148,7 +263,7 @@ int test_run_tests(struct test_module *module) return ret; for (test_case = module->test_cases; test_case->run_case; test_case++) { - success = test_run_case(&test, module, test_case); + success = test_run_case_catch_errors(&test, module, test_case); if (!success) all_passed = false;